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TIL the entire United States Interstate highway system cost $114 Billion to construct ($660 Billion adjusted for inflation), and contains nearly 50,000 miles of roads. It has generated ~6x its cost in revenue (again, adjusted for inflation).

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grBAL TIL that researchers long thought US President William Harrison died from an illness he caught giving a lengthy inaugural speech in the rain. But recent research suggests he caught typhoid fever due to the White House’s water supply being downstream of public sewage.
DkxY TIL: Terry Fox, a 21 year old one-legged cancer patient, ran 3,339miles across Canada in 143 days before dying. He ran the equivalent of a full marathon every day and was the youngest person ever named a Companion of the Order of Canada.
690Yw TIL that KFC’s handwritten recipe is stored in a safe within a vault at KFC’s Louisville headquarters. To maintain confidentiality, KFC employs two separate suppliers: one blends part of the recipe, and the other completes it, ensuring no single entity has access to the entire formulation. 
kO8Lm TIL: Of Sir Nicholas Windon, who saved 669 children in 1938 from German concentration camps. He kept his heroic deed a secret for 50 years, until his wife found a list of the children's names in their attic.
0dwmA TIL Aaron Taylor-Johnson (star of Kick-Ass) married his now wife after they met on set, he was 18 and she was 42 at the time.