The science pros at TKOR build a DIY hot-wire styrofoam slicer for cheap crafting.

A large crowd, many wearing foam hot dog hats, braved high temperatures to witness the annual eat-a-thon, held outside the original Nathan’s Famous restaurant in Coney Island, New York, since 1972.

A large crowd, many wearing foam hot dog hats, braved high temperatures to witness the annual eat-a-thon, held outside the original Nathan’s Famous restaurant in Coney Island, Brooklyn, since 1972.

A large crowd, many wearing foam hot dog hats, braved high temperatures to witness the annual eat-a-thon, held outside the original Nathan’s Famous restaurant in Coney Island, Brooklyn, since 1972.

A large crowd, many wearing foam hot dog hats, braved high temperatures to witness the annual eat-a-thon, held outside the original Nathan's Famous restaurant in Coney Island, Brooklyn, since 1972.

A large crowd, many wearing foam hot dog hats, braved high temperatures to witness the annual eat-a-thon, held outside the original Nathan’s Famous restaurant in Coney Island, Brooklyn, since 1972.

NEW YORK — The Nathan’s Famous Fourth of July hot dog eating contest is back, and famed competitive eater Joey “Jaws” Chestnut is hoping for a comeback 17th win on Friday. The 41-year-old ...