Thus a pair of brown rats can produce as many as 2,000 descendants in a year if left to breed unchecked. (A rat matures sexually at age three to four months.) An average rat's life span is two to three years.5 A rat can tread water for three days and survive being flushed down the toilet.hus a pair of brown rats can produce as many as 2,000 descendants in a year if left to breed unchecked. (A rat matures sexually at age three to four months.) An average rat's life span is two to three years.
Late lice. The common head louse, Pediculus humanus capitis, may take as long as 14 days to hatch. Gilles San Martin/Wikimedia Commons. Hereâs some lousy news for parents of itchy-headed kids: Lice eggs can take 2 weeks to hatch in human hair, making standard 7-day delousing treatments ineffective in some cases.
It takes seven to 10 days for lice eggs to hatch, so if you dye your hair, even if the chemicals in the hair dye kill all the live bugs on your head, in a week or so all the eggs will hatch and youâll have a full infestation in your hair again.Using hair dye is not a good way to treat lice.Note that having dyed hair does not prevent you from getting lice. People with dyed or bleached hair are just as likely to get lice as those with natural hair color.sing hair dye is not a good way to treat lice. Note that having dyed hair does not prevent you from getting lice. People with dyed or bleached hair are just as likely to get lice as those with natural hair color.