After Dark: Seeing Double

PRESENTATIONS

Double Dutch Demonstration
With the Bay Area Double Dutch League
7:00 and 8:30 p.m.  |  Bechtel Gallery 3

Jump in on the fun with the Bay Area Double Dutch League as they demonstrate the skipping skills required to bring the schoolyard sport to a competitive level. Get educated on the history and benefits of skipping rope and test your own footwork against two ropes and two turners.

The Last Doubling
With Ron Hipschman
8:30 p.m.  |  Osher Gallery 1, Kanbar Forum

Is growth always good? The biggest threat to our existence on planet Earth isn’t asteroids—it’s us. Why can’t our population continue to grow? Learn about the exponential function and the conclusions we can draw from it with Exploratorium scientist Ron Hipschman.

ONGOING

Two-Faced
6:00–10:00 p.m.  |  Osher Gallery 1

Face up to your own hidden faces. Most faces aren’t perfectly symmetrical; by posing for a double selfie and “mirroring” each side of your face, you can see two different, symmetrical versions of yourself. Does one look more natural than the other, or more like your actual face?

In Silhouette
6:00–10:00 p.m.  |  Osher Gallery 1, Black Box

In Silhouette invites you to experience remarkably complex and inventive works of shadow play. Arm yourself with a handheld flashlight and bring these optical wonders to light.

Multiply Me
With John Proffitt
6:30–9:30 p.m.  |  Osher Gallery 1, Math Cinema

Duplicate yourself in this reflective experience by industrial designer John Proffitt. This “poly-mirror” is a prototype that presents a doubled and reversed image alongside the user’s usual reflection, making it possible to pose in kaleidoscopic shapes, mix colors, and high-five with only one hand.

Thaumatropes
With Explorables
7:00–10:00 p.m.  |  Bechtel Gallery 3, Sun Painting

Make a thaumatrope, a Victorian-era toy that spins two pictures into a single image with the help of string and the phenomenon of persistence of vision. All materials provided; take what you make.

Endangered Species Condoms
With the Center for Biological Diversity
6:30–9:30 p.m.  |  Gallery 4 Corridor

The rapid growth of our human population is pushing other species off the planet, but you can help slow the process in one very specific way. Come pick up some free endangered species-themed condoms and learn a little about the link between human population growth and the species extinction crisis.

Double-Take a “Cell-fie”
With Rebecca McGillivary
6:30–9:30 p.m.  |  Gallery 4 Bio Bar

Get ready for the ultimate close-up and take a photo of yourself with your very own cells. Learn about the tiny building blocks that make up your body by viewing your own cheek cells under a microscope. Then take your own “cell-fie” and double-expose your face with an image of your cells, showing off what you look like at two vastly different magnifications.

How Many HeLa?
With Sam Reisman
7:00–9:00 p.m.  |  Gallery 4

Imagine the city of San Francisco covered completely in living cells. Groups of dividing cells expand exponentially, and cells that can grow in vitro, like HeLa cells, may divide rapidly and indefinitely—so come chat with Exploratorium biologist Sam Reisman and figure out how long it would take for HeLa cells to grow to cover all 49 square miles.