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00:20:27
While demonstrating how to build an electromechanical digital clock, Jim Newton talks about different kinds of tools—from low-tech, such as a drill press or a welder, to high-tech, such as laser and plasma cutters. Jim is a lifetime maker, veteran BattleBots builder, and former MythBuster.

00:40:59
In this zany competition teachers have ten minutes to create a science activity from a special secret ingredient. This week: paint.

00:27:55
It's geometry! It's knitting! It's—hyperbolic crochet! Artist and science writer Margaret Wertheim shows you how to represent a hyperbolic plane using crochet hooks and yarn. Beginning with a simple crochet chain, learn how to create a geometric shape with a constant negative curvature just by adding stitches.

00:54:10
In this zany competition teachers have ten minutes to create a science activity from a special secret ingredient. This week: sugar.

00:33:42
Tinkerer, programmer, and musician Ken Murphy shows how to build electromechanical "bugs" built from scavenged materials and powered with a single coin-cell battery. When the Blinkybug's wire antennae detect motion from air currents or vibrations, the bug comes to life, with its LED eyes blinking in rhythmic patterns.

01:01:45
In this zany competition teachers have ten minutes to create a science activity from a special secret ingredient. This week: baseball equipment.

00:47:04
In this zany competition teachers have ten minutes to create a science activity from a special secret ingredient. This week: plastic water bottles.

00:31:01
In this interactive presentation with Exploratorium biologist Karen Kalumuck, find out how flowers entice bees, what bees see in a flower, and the importance of bees to agriculture. Also learn about Colony Collapse Disorder, which is causing once-thriving honeybee colonies to disappear.

00:00:24
The Jakobshavn Isbrae is among the fastest-moving glaciers in the world. The Jakobshavn is an outlet glacier, one of the few places where the giant Greenland ice sheet can shed ice in the form of gigantic icebergs. This timelapse video by Jason Amundson of the University of Alaska Fairbanks shows one of these massive calving events. Notice the dark blue ice that surfaces when the iceberg flips over in the ice-choked Ilulissat icefjord.

00:30:48
Dr. Tejal Desai of UCSF talks about the intersection of nanotechnology and medicine, an area of research that has dramatic implications for the future. It could lead to artificially engineered tissues, or more effective drug delivery. It could also result in new kinds of health monitoring devices, as Dr. Thomas Murray, from the Hastings Center, explains.