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Protons are made up of even smaller particles called quarks, so you might expect that simply adding up the quarks’ masses should give you the proton’s mass. However, that sum is much too small to explain the proton’s bulk. And new, detailed calculations show that only 9 percent of the proton’s heft comes from the mass of constituent quarks. The rest of the proton’s mass comes from complicated effects occurring inside the particle, researchers report in the Nov. 23 Physical Review Letters.

DQXvg TIL that at the 1996 Summer Olympics Men’s 5000 metres race, for the first time in history all medalists were from Africa, with Burundi winnings its first gold medal, and Kenya and Morocco winning silver and bronze respectively.
9Y56M TIL that the green falling code in The Matrix is actually sushi recipes. Simon Whiteley, the creator of the Matrix' distinctive code, said he scanned characters from his wife's Japanese cookbook and then manipulated them
wLBrY TIL that Walt Disney accidentally "kidnapped" Richard Nixon by dispatching his monorail train before the Secret Service could get on. The agents ran after the train and attempted to jump onboard but the doors had already closed. Monorail pilot Bob Gurr was terrified; Nixon got a kick out of it.
nWoVo TIL The United States and India have the most total English speakers, with 306 million and 265 million. Followed by Pakistan (104 million), the United Kingdom (68 million), and Nigeria (60 million)
Zrk4 TIL the rarest element on Earth is the halogen Astatine. It’s so rare that only 30 grams of it can be found at any point in time on Earth, and only 0.05 micrograms of it has been produced to date. Most of its properties are unknown and no one has ever seen it in its natural form.