The public is invited to celebrate the world’s favorite mathematical holiday at its birthplace ...

This seasonal celebration of hands-on tinkering and experimentation invites everyone to create, explore, and color their ...

Artist Bob Miller's Light Walk at the Exploratorium will change the way you look at light, shadow, and images.

Make a saturated salt solution by adding salt to water and stirring until it doesn't dissolve anymore. Add a splash of vinegar to this solution. Cut your matboard into four 1/2-inch squares, each ...

You probably already know how to play Tic-Tac-Toe. It's a really simple game, right? That's what most people think. But if you really wrap your brain around it, you'll discover that Tic-Tac-Toe isn't ...

It might seem obvious to say that earthquakes do most of their damage by shaking the ground. But groundshaking is actually a complex phenomenon. Engineering the seismic safety of a structure involves ...

Visiting San Francisco? Bundle Exploratorium admission with 3 more top San Francisco attractions and save up to 46% with CityPass® tickets.

Every day, look at the food in your Mold Terrarium. For the first two or three days, you probably won't see much. But soon you should see blue or green or white fuzzy stuff growing on some of the ...

All year long we set aside Sunday mornings for Daytime members, donors, and Corporate members—10:00 a.m. to noon is just for you. Join us for a leisurely visit, enjoy lunch at the Tinkering Table ...

Take off and fly in a mirror that makes half your body look whole. Here’s an exhibit where watching is at least half the fun. Positioned at one end of this large flat mirror, you can create any number ...

It's all done with mirrors. Touching the spring seems easy, but the image of a spring is made by a big curved concave mirror. Light from a real spring bounces off the mirror to form the image you see.