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TIL Corn was genetically engineered by farmers thousands of years ago

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lopa1 TIL: Viruses evolve differently to adapt to their mode of transmission. A water-borne virus (e.g. cholera) is virulent because fecal matter can transmit to care-givers. OTOH, droplet-borne viruses (flu, SARS) become less virulent over time to create more ambulatory carriers for transmission.
r1G4 TIL That by the age of two months, Los Angeles-area infants have already inhaled enough toxic pollutants to reach the EPA lifetime limit for cancer risk.
9Ed6 TIL Tagalog is the fifth most spoken language in the united states, ranking higher than Vietnamese, Korean, German, Arabic and Russian.
69RaZ TIL only 31 cities in Australia have a population of over 50,000. In the US, 50,000 is about the size of Enid, Oklahoma or Galveston, Texas.
Qw7X TIL rats like to be tickled. However their vocalizations in response that resemble laughter fall in a range between 20-100khz which is outside the range of human hearing.