https://padlet.com/tw22612/eacplf9yhk61am5 en-us 2021-02-15 18:33:12 UTC 2021-02-16 12:59:37 UTC hello@padlet.com tw22612 https://padlet.com/tw22612/eacplf9yhk61am5/wish/1204589440 Penicillin is a medicine that fought off infections.]]> 2021-02-15 18:54:17 UTC https://padlet.com/tw22612/eacplf9yhk61am5/wish/1204589440 tw22612 https://padlet.com/tw22612/eacplf9yhk61am5/wish/1204632035 an antibiotic or group of antibiotics produced naturally by certain blue molds, and now usually prepared synthetically.]]> 2021-02-15 19:11:21 UTC https://padlet.com/tw22612/eacplf9yhk61am5/wish/1204632035 tw22612 https://padlet.com/tw22612/eacplf9yhk61am5/wish/1204633719 2021-02-15 19:12:05 UTC https://padlet.com/tw22612/eacplf9yhk61am5/wish/1204633719 tw22612 https://padlet.com/tw22612/eacplf9yhk61am5/wish/1204634625 A radar is a device that uses sound to track enemies down.]]> 2021-02-15 19:12:29 UTC https://padlet.com/tw22612/eacplf9yhk61am5/wish/1204634625 tw22612 https://padlet.com/tw22612/eacplf9yhk61am5/wish/1204638236 a system for detecting the presence, direction, distance, and speed of aircraft, ships, and other objects, by sending out pulses of high-frequency electromagnetic waves that are reflected off the object back to the source.]]> 2021-02-15 19:13:49 UTC https://padlet.com/tw22612/eacplf9yhk61am5/wish/1204638236 tw22612 https://padlet.com/tw22612/eacplf9yhk61am5/wish/1204643225 2021-02-15 19:16:02 UTC https://padlet.com/tw22612/eacplf9yhk61am5/wish/1204643225 tw22612 https://padlet.com/tw22612/eacplf9yhk61am5/wish/1204686234 A enigma machine is a machine to create and send a secret messages.]]> 2021-02-15 19:34:20 UTC https://padlet.com/tw22612/eacplf9yhk61am5/wish/1204686234 tw22612 https://padlet.com/tw22612/eacplf9yhk61am5/wish/1204693475 a small portable electro-mechanical rotor machine used to encrypt and decrypt secret messages, made famous by Germany in WWII.]]> 2021-02-15 19:37:22 UTC https://padlet.com/tw22612/eacplf9yhk61am5/wish/1204693475 tw22612 https://padlet.com/tw22612/eacplf9yhk61am5/wish/1204709961 2021-02-15 19:44:17 UTC https://padlet.com/tw22612/eacplf9yhk61am5/wish/1204709961 tw22612 https://padlet.com/tw22612/eacplf9yhk61am5/wish/1206735270 The atomic bomb  was the first weapon of destruction.]]> 2021-02-16 12:50:44 UTC https://padlet.com/tw22612/eacplf9yhk61am5/wish/1206735270 tw22612 https://padlet.com/tw22612/eacplf9yhk61am5/wish/1206748832 a bomb which derives its destructive power from the rapid release of nuclear energy by fission of heavy atomic nuclei, causing damage through heat, blast, and radioactivity.]]> 2021-02-16 12:55:22 UTC https://padlet.com/tw22612/eacplf9yhk61am5/wish/1206748832 tw22612 https://padlet.com/tw22612/eacplf9yhk61am5/wish/1206758873 2021-02-16 12:58:51 UTC https://padlet.com/tw22612/eacplf9yhk61am5/wish/1206758873