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TIL the star ratings hotels advertise have requirements. They're independently measured based on what facilities guests can use, ranging from basic things like elevators to less common conveniences like a fitness center. The exact requirements vary some based on which body oversees the hotel.

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6EKpY TIL The Velociraptor that we all know and love from Jurrasic Park/NBA fame is a far cry from what the creature actually looked like. Not only was it small, but it also had feathers.
p8aX8 TIL that Dan Shechtman was shamed for his ideas on quasicrystals. A Nobel laureate commented that 'there is no such thing as quasicrystals, only quasi-scientists'. In 2011 Dan Schechtman was awarded the Nobel Prize for the discovery of quasicrystals.
BgOwD TIL that in 1997, a crew member on the USS Yorktown (CG-48) entered 0 into a database field. It caused the Remote Data Base Manager to attempt to divide by zero, causing all machinery on the network to stop working, including the propulsion system.
1aodr TIL 4-dimensional printing uses the same techniques of 3D printing through computer-programmed deposition of material in successive layers to create a three-dimensional object. However, 4D printing adds the dimension of transformation over time. It is therefore a type of programmable matter.
D1Jgj TIL Sub-replacement fertility that is a fertility rate which, if sustained, leads to each new generation being less populous than the older is around 2.33 as opposed to the intuitive guess of 2 children per woman.