What If You Could Shrink?

A drop of milk is bigger than a car. Because you're the size of an ant. Close your fist and you shrink in one second. Open it and you grow back, but that takes an hour, and once it starts nothing can stop it. It's the best trick in the world, until your little brother falls down a borehole 25 centimetres wide. The rescuers need three days. You're the only one who fits. 0:00 Breakfast at ant size 0:23 One second down, one hour back 0:37 The hole 1:09 The only one who fits 1:36 The fall doesn't hurt 2:03 A river with a skin 2:22 Strong and cold 2:39 Something lives down here 2:53 The hurricane 3:13 Seventy metres 3:44 A voice nobody hears 4:13 Somebody hears you 4:56 Keep him alive 6:05 Things that grow 6:35 The hour 7:25 And you? Would you go down the hole? Tell us in the comments. If you'd shrink for your little brother, leave a like. Part 2 is coming. Real science in this video A mouse dropped down a mine shaft walks away; small animals lose heat fast; a wet insect is trapped by water: J.B.S. Haldane (1926), "On Being the Right Size", Harper's Magazine. Surface tension and water striders: Hu, Chan & Bush (2003), "The hydrodynamics of water strider locomotion", Nature 424, 663–666. Ants carry many times their body weight: Nguyen et al. (2014), Journal of Biomechanics 47(11). Spider silk, for its weight, is stronger than steel: Gosline et al. (1999), Journal of Experimental Biology 202. Mice talk in ultrasound we can't hear: Portfors (2007), Journal of the American Association for Laboratory Animal Science 46(1). Dogs hear up to about 45 kHz, people about 20 kHz: Heffner (1983), Behavioral Neuroscience 97(2). Growing roots push hard enough to crack rock: Bengough et al. (2011), Journal of Experimental Botany 62(1). The story is fiction. No real rescue is shown or referred to.