On 17 February 1869, Russian chemist Dmitri Mendeleev jotted down the symbols for the chemical elements, putting them in order according to their atomic weights and inventing the periodic table.

The modern periodic table, arranged in rows and columns, was first introduced by Dmitri Mendeleev in 1869. At the time, it included the known elements and their properties, but Mendeleev predicted ...

Those drawings were mostly just pictures of words. I don’t really think of them as visualizing the content of the ... That became the photographic installation, the experiential element. What I like ...

Joel Achenbach writes about science and politics for The Washington Post's National desk. He has been a staff writer for The Post since 1990. He started the newsroom’s first online column, Rough ...

12.This teacher proved that a good teacher never forgets their favorite students. The text reads (with minor grammar edits): ...

Hundreds of Wordle puzzles have passed since the game was first unleashed onto the world, and there's now a burgeoning repository of words that now cannot be used for any future Wordle puzzles. If you ...

Space can be a wondrous place, and we've got the pictures to prove it! Take a look at our favorite space pictures here, and if you're wondering what happened to today in space history don't miss ...

This word has appeared in 25 articles on NYTimes.com in the past year. Can you use it in a sentence? By The Learning Network This word has appeared in 23 articles on NYTimes.com in the past year.

Best photos of March 4: Heavy snow in Korea to Bolivia's indigenous carnival Sheikh Hamdan joins Hatta troops for iftar - in pictures ...