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.
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. The information collected has led for instance to the discovery that the Moon creeps 38 mm further away from us every year.