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TIL At a length of 130m and able to carry more than 7000 men (4000 being rowers) the Tessarakonteres was the largest ship built in antiquity. Built by order of Ptolemy IV Philopator in the 3rd century BCE she required an early dry dock to construct. Ultimately her great size made her impractical.

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w7w6 TIL up to a quarter of California smog originates in China
KYRNw TIL the King of Hanover offered convicts free passage to America with fake passports and names as an alternative to a costly prison sentence
OGPoe TIL researchers have found that the ancient Romans manipulated chemistry to make "quicklime" that caused "self healing" concrete, thereby preserving ancient Roman architecture, and answering why so many of their structures remain standing when modern structures fail.
MeDyA TIL about the trials for Rocket Mail. Since 1810 inventors have tried to deliver mail via artillery, and later rockets. In 1959 the US navy fired a cruise missile filled with mail from a submarine to a Naval base in Florida. Despite enthousiasm by the Postmaster General it was a one time thing.
Xk1k TIL that when studying sea anemones off the coast of Yemen, researchers discovered that there’s no natural enemy for the Yemeni anemone.