1999
| 1990s |
| 1990 | 1991 | 1992 | 1993 | 1994 | 1995 | 1996 | 1997 | 1998 | 1999 |
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November, 1999. Falling into Chaos |
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| Cost:$0-100 | Difficulty:  |
Danger 2: (Minor injury possible) | Utility:  |
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October, 1999. Modeling the Atomic Universe |
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| Cost:$0-100 | Difficulty: |
Danger 1: (No hazards) | Utility: |
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September, 1999. Counting Atmospheric Ions |
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| Cost:$100+ | Difficulty:  |
Danger 2: (Minor injury possible) | Utility: |
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August, 1999. Sun of a Gun |
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| Cost:$0-100 | Difficulty: |
Danger 3: (Serious injury possible) | Utility: |
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July, 1999. Detecting the Earth's Electricity |
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| Cost:$100+ | Difficulty: |
Danger 2: (Minor injury possible) | Utility: |
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June, 1999. Museum Secrets of Preserving Plants |
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| Cost:$0-100 | Difficulty:  |
Danger 1: (No hazards) | Utility: |
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May, 1999. Hot View of a Microscopic World |
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| Cost:$0-100 | Difficulty: |
Danger 2: (Minor injury possible) | Utility: |
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April, 1999. Detecting "Hot" Clouds |
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| Cost:$0-100 | Difficulty: |
Danger 1: (No hazards) | Utility: |
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March, 1999. Home-Made Precision Thermometer |
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| Cost:$0-100 | Difficulty: |
Danger 3: (Serious injury possible) | Utility: |
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February, 1999. Tackling the Triple Point |
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| Cost:$0-100 | Difficulty: |
Danger 3: (Serious injury possible) | Utility: |
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January, 1999. Taking the Earth's Magnetic Pulse |
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| Cost:$100+ | Difficulty: |
Danger 2: (Minor injury possible) | Utility: |
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December, 1998. Sorting Molecules with Electricity |
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| Cost:$0-100 | Difficulty: |
Danger 1: (No hazards) | Utility: |
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November, 1998. Floating a Challenge |
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| Cost:$100+ | Difficulty:  |
Danger 1: (No hazards) | Utility: |
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October, 1998. Spying on an Invisible World |
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| Cost:$0-100 | Difficulty: |
Danger 1: (No hazards) | Utility: |
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September, 1998. Spooling the Stuff of Life |
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| Cost:$0-100 | Difficulty: |
Danger 1: (No hazards) | Utility: |
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August, 1998. Building a Consciousness of Streams |
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| Cost:$0-100 | Difficulty: |
Danger 1: (No hazards) | Utility: |
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July, 1998. A Year for the Oceans |
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| Cost:$0-100 | Difficulty: |
Danger 1: (No hazards) | Utility: |
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June, 1998. Waiter, There's a Hair in My Hygrometer |
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| Cost:$100+ | Difficulty: |
Danger 1: (No hazards) | Utility: |
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May, 1998. Detecting Subtle Tsunamis |
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| Cost:$0-100 | Difficulty: |
Danger 1: (No hazards) | Utility: |
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April, 1998. Experiments Out of Thin Air |
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| Cost:$0-100 | Difficulty: |
Danger 3: (Serious injury possible) | Utility: |
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March, 1998. The Pleasures of Pond Scum |
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| Cost:$0-100 | Difficulty: |
Danger 1: (No hazards) | Utility: |
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February, 1998. Bird Watching By the Numbers |
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| Cost:$0-100 | Difficulty: |
Danger 1: (No hazards) | Utility: |
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January, 1998. A Kitchen Centrifuge |
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| Cost:$0-100 | Difficulty: |
Danger 3: (Serious injury possible) | Utility: |
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December, 1997. Taking Back the Final Frontier |
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| Cost:$100+ | Difficulty:  |
Danger 3: (Serious injury possible) | Utility: |
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November, 1997. Caught in a Wind Tunnel |
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| Cost:$0-100 | Difficulty: |
Danger 1: (No hazards) | Utility: |
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October, 1997. Recording the Sounds of Life |
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| Cost:$0-100 | Difficulty: |
Danger 1: (No hazards) | Utility: |
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September, 1997. The Mysteries of Migrating Monarchs |
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| Cost:$0-100 | Difficulty: |
Danger 1: (No hazards) | Utility: |
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August, 1997. Getting a Charge Out of Rain |
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| Cost:$100+ | Difficulty: |
Danger 1: (No hazards) | Utility: |
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July, 1997. How-to's of Butterfly Rookeries |
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| Cost:$0-100 | Difficulty: |
Danger 1: (No hazards) | Utility: |
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June, 1997. Getting Inside an Ant's Head |
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| Cost:$0-100 | Difficulty: |
Danger 1: (No hazards) | Utility: |
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May, 1997. When Hazy Skies Are Rising |
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| Cost:$0-100 | Difficulty: |
Danger 1: (No hazards) | Utility: |
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April, 1997. The Joys of Armchair Ornithology |
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| Cost:$0-100 | Difficulty: |
Danger 1: (No hazards) | Utility: |
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March, 1997. Algorithm of the Gods |
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| Cost:$0-100 | Difficulty: |
Danger 1: (No hazards) | Utility: |
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February, 1997. A Picture Perfect Comet |
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| Cost:$100+ | Difficulty: |
Danger 1: (No hazards) | Utility: |
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January, 1997. Catching a Comet By Its Tail |
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| Cost:$0-100 | Difficulty: |
Danger 1: (No hazards) | Utility: |
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December, 1996. Dissecting the Brain with Sound |
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| Cost:$0-100 | Difficulty: |
Danger 1: (No hazards) | Utility: |
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November, 1996. Much Ado about Nothing |
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| Cost:$0-100 | Difficulty: |
Danger 3: (Serious injury possible) | Utility: |
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October, 1996. Working in a Vacuum |
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| Cost:$100+ | Difficulty: |
Danger 3: (Serious injury possible) | Utility: |
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September, 1996. The Pleasures of Exploring Ponds |
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| Cost:$0-100 | Difficulty: |
Danger 1: (No hazards) | Utility: |
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August, 1996. Detecting Micron-Sized Movements |
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| Cost:$0-100 | Difficulty: |
Danger 1: (No hazards) | Utility: |
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July, 1996. Covert Observations of Nesting Sparrows |
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| Cost:$0-100 | Difficulty: |
Danger 1: (No hazards) | Utility: |
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June, 1996. Homemade Microgram Electrobalances |
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| Cost:$0-100 | Difficulty: |
Danger 1: (No hazards) | Utility: |
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May, 1996. Detecting Natural Electromagnetic Waves |
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| Cost:$100+ | Difficulty: |
Danger 2: (Minor injury possible) | Utility: |
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April, 1996. The New Backyard Seismology |
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| Cost:$100+ | Difficulty: |
Danger 1: (No hazards) | Utility: |
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March, 1996. Exploring Chemical Bonds |
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| Cost:$0-100 | Difficulty: |
Danger 2: (Minor injury possible) | Utility: |
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February, 1996. Growing Plants in Less Than One G |
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| Cost:$0-100 | Difficulty: |
Danger 1: (No hazards) | Utility: |
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January, 1996. Recording Nature's Sounds |
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| Cost:$0-100 | Difficulty: |
Danger 1: (No hazards) | Utility: |
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December, 1995. Measuring the Metabolism of Insects |
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| Cost:$0-100 | Difficulty: |
Danger 2: (Minor injury possible) | Utility: |
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November, 1995. Measuring the Wind with Hot Metal |
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| Cost:$0-100 | Difficulty: |
Danger 2: (Minor injury possible) | Utility: |
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August, 1995. Detecting Signals with Noise |
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| Cost:$0-100 | Difficulty: |
Danger 2: (Minor injury possible) | Utility: |
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June, 1995. Computing Bouts of the Prisoner's Dilemma |
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| Cost:$0-100 | Difficulty: |
Danger 1: (No hazards) | Utility: |
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April, 1995. Computerized Restoration of Juvenile Art |
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| Cost:$0-100 | Difficulty: |
Danger 1: (No hazards) | Utility: |
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February, 1995. Producing Light From a Bubble of Air |
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| Cost:$0-100 | Difficulty: |
Danger 3: (Serious injury possible) | Utility: |
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December, 1994. Measuring the Energy Drain on Your Car |
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| Cost:$0-100 | Difficulty: |
Danger 3: (Serious injury possible) | Utility: |
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October, 1994. Building an Electronic Neuron |
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| Cost:$100+ | Difficulty: |
Danger 2: (Minor injury possible) | Utility: |
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August, 1994. Scanning Underwater Surfaces |
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| Cost:$100+ | Difficulty: |
Danger 2: (Minor injury possible) | Utility: |
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June, 1994. Genetically Altering Escherichia Coli |
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| Cost:$0-100 | Difficulty: |
Danger 2: (Minor injury possible) | Utility: |
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April, 1994. The Kitchen As a Lab |
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| Cost:$0-100 | Difficulty: |
Danger 2: (Minor injury possible) | Utility: |
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February, 1994. Making a Mirror By Spinning a Liquid |
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| Cost:$0-100 | Difficulty: |
Danger 2: (Minor injury possible) | Utility: |
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December, 1993. Electronic Fireflies |
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| Cost:$0-100 | Difficulty: |
Danger 1: (No hazards) | Utility: |
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October, 1993. Making Fluids into Solids with Magnets |
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| Cost:$0-100 | Difficulty: |
Danger 1: (No hazards) | Utility: |
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August, 1993. Circuits That Get Chaos in Sync |
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| Cost:$0-100 | Difficulty: |
Danger 2: (Minor injury possible) | Utility: |
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May, 1993. Mapping to Preserve a Watershed |
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| Cost:$0-100 | Difficulty: |
Danger 1: (No hazards) | Utility: |
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March, 1993. Flight-Testing Fruit Flies |
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| Cost:$0-100 | Difficulty: |
Danger 1: (No hazards) | Utility: |
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January, 1993. Biodiversity in the Backyard |
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| Cost:$0-100 | Difficulty: |
Danger 1: (No hazards) | Utility: |
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November, 1992. Sighting Cepheid Variables |
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| Cost:$0-100 | Difficulty: |
Danger 1: (No hazards) | Utility: |
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September, 1992. Neurons for Computers |
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| Cost:$0-100 | Difficulty: |
Danger 1: (No hazards) | Utility: |
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July, 1992. Survival of the Fittest Bits |
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| Cost:$0-100 | Difficulty: |
Danger 1: (No hazards) | Utility: |
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May, 1992. Watching the Death of a Star |
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| Cost:$0-100 | Difficulty: |
Danger 1: (No hazards) | Utility: |
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March, 1992. Seeing Infrared |
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| Cost:$0-100 | Difficulty: |
Danger 2: (Minor injury possible) | Utility: |
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January, 1992. How to Generate Chaos At Home |
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| Cost:$0-100 | Difficulty: |
Danger 1: (No hazards) | Utility: |
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November, 1991. Painting in Color Without Pigments |
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| Cost:$0-100 | Difficulty: |
Danger 3: (Serious injury possible) | Utility: |
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October, 1990. A Remote-Control Camera That Catches the Wind and Captures the Landscape |
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| Cost:$0-100 | Difficulty: |
Danger 1: (No hazards) | Utility: |
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August, 1990. How to Monitor Ultraviolet Radiation From the Sun |
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| Cost:$0-100 | Difficulty: |
Danger 1: (No hazards) | Utility: |
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June, 1990. Sunspots and How to Observe Them Safely |
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| Cost:$0-100 | Difficulty: |
Danger 3: (Serious injury possible) | Utility: |
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April, 1990. A Homemade Laser That Emits Powerful Bursts of Green and Yellow Light |
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| Cost:$100+ | Difficulty: |
Danger 4: (POSSIBLY LETHAL!!) | Utility: |
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February, 1990. When a Polymer Sheet Is Stretched, It May "Neck" Long Before It Snaps |
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| Cost:$0-100 | Difficulty: |
Danger 1: (No hazards) | Utility: |
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January, 1990. A Backyard Version of the Stirling Engine Can Be Built with Common Materials |
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| Cost:$0-100 | Difficulty: |
Danger 1: (No hazards) | Utility: |