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TIL polarized glasses can make water appear more transparent and are commonly used by fishermen

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wLyRW TIL on 9/11 one stairwell within the South Tower remained accessible after impact. Obscured by smoke and fire, most above the impact zone believed the stairs destroyed and headed to the roof hoping for a helicopter rescue. Only four people among them realized the stairs were accessible and escaped.
aAW0 TIL That there is a mountain in Australia named Mt. Disappointment, named as the explorers found the view from it sub par and wanted to reflect that.
X0wVP TIL about Skywave, a phenomenon in which radio signals "bounce" off the Earth's ionosphere. This mainly applies to AM and short wave radio signals which is why they can reach further distances.
nW7oW TIL: Hammerhead sharks are only around 20 million years old. Despite most modern species keeping the same basic game plan for 300m+, this body design is fairly new to the evolutionary scene. Oh, and they can see 360° 🔨🦈
N7XK6 TIL there used to be a Latin warning describing the Strait of Gibraltar: "NON PLUS ULTRA", or "Nothing further beyond". After Spain reaped huge rewards proving that this wasn't quite true, they made their national motto "PLUS ULTRA", or "Further beyond".