More than 20,000 medicinal plants grow in African rainforests, but the forests are disappearing rapidly. Two artists created a tickle robot, which offers surprising benefits. Community gardens in Argentina prove remarkably effective at providing organic produce for 3 million people. A tiny camera, the size of a pill, is swallowed and then broadcasts thousands of good-quality full-color photos from inside the body. A British mountaineer does not let kidney disease stop him from climbing and paragliding. The latest in espionage is a tooth implant that receives up telecommunications. Left-handed people must make do in a right-handed world. A tanning pill imparts that glow without any exposure to the sun. Drinking plenty of water is key to staying hydrated in hot weather. Halle Berry talks about living with diabetes, a disease that is spreading at an alarming rate worldwide.