1 Place the cotton balls in areas where mice are likely to enter your house, by doorways or heat vents, etc. 2  Another helpful deterrent is to grow peppermint plants near the entryways. 3  You can use the mint in cooking as well as it serving a deterrent purpose.
Nov 12, 2015. 20 kilometers (12 miles) for a 1 milliwatt beam. Laser light can travel 20 kilometers (12 miles) per-milliwatt that is contained within the laser.
Astronauts on the Apollo 11, 14 and 15 missions positioned retro-reflectors (a bit like the catâs eyes you see on roads) on the surface of the Moon. Physicists bounce a pulse of laser off one of these reflectors, timing how long it takes for the laser beam to make the return trip - about two and a half seconds. Since we know the speed of light, they can then work out how far away the Moon is to within a few millimetres. This project is called the Lunar Laser Ranging experiment and it took measurements every year between 1969 and 2009.