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.
On the ground, laser pointers appear to have a weak, diluted projection. Thatâs because general consumer-use pointers are not allowed to exceed 5 milliwatts (mW). But people tend to underestimate just how far the light can be thrown, or what happens to it once it settles on a passing airplane or helicopter.