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TIL about Planet 9, a hypothetical ninth planet in the outer region of our solar system. The planet has not been directly observed, but the gravitational effects of the planet could explain the unique orbits of bodies beyond Neptune, which orbit the sun as a single cluster.

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W7YNB TIL the Indian city of Vijayanagara was likely the second largest city in the world at the start of the 1500s, with an estimated 500,000 residents. Following a six-month siege, Vijayanagara was abandoned in 1565 and never rebuilt.
5YGW9 TIL: If your kids want to have a lemonade stand in Canada's capital city, Ottawa, the sign must be in English and French, as well 7% of the profits must be donated to charity.
ORwa TIL of Death Valley Unified School District, which covers 6000sq miles but serves only 60 students, making both one of the largest and smallest districts in the USA. It is also the only district with a school inside a national park.
XEXQ6 TIL termites are being researched as a possible renewable energy source as they can produce up to 2 litres of hydrogen from ingesting a single sheet of paper, making them one of the planet's most efficient bioreactors
MeOpK TIL: The average large pizza from Dominos and Pizza Hut in Japan costs $35. Delivery pizza is considered a luxury.