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.
Depends on what you mean by seeing. The particle horizon is just the furthest. distance light could have traveled to us since the universe began. That is 93 billion. light years in diameter, or 47 billion light years in any direction, but we can't actually. see anything at that distance.