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TIL that a parasite, Toxoplasma Gondii, can change rodent behaviour by reducing their ability to sense feline predators making them easy prey. The parasite can then pass from rodent to cat and then cat to human.

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YvDW TIL in a part of southern India there is a custom for children to kill their parents when they get too old or if they can’t afford to take care of them.
DQe7e TIL that a neutron star is the densest known substance in the universe. A tablespoon of neutron star weighs more than Mount Everest.
EpPw TIL the license plate “2GAT123” has appeared in numerous films and TV shows since the 1980s. It is essentially the “555- phone number” of license plates.
7aRX TIL the US Department of Justice and the National Institute of Justice reported in 2004 that the effects of renewing the 1994 assault weapon ban might be “too small for reliable measurement” because “[assault weapons] were rarely used in gun crimes even before the ban”.
4kBWJ TIL that there exists a rare phenomenon called "sun pillars," which are vertical shafts of light extending upward from the sun during sunrise or sunset. These optical illusions are caused by the reflection and refraction of sunlight by ice crystals in the atmosphere.