per mm. This work has revealed that the line in the neighbourhood of 1000 cm.-1, always characteristic of the benzene ring, is complex.

Update on October 24, 2024: Added information about the Oura Ring 4, which launched in early October 2024. I love my fitness trackers, but not everyone enjoys a bulky watch on their wrist.

Kathleen Lonsdale got in on the ground floor of X-ray crystallography soon after its discovery in the early 20th century, and used it to prove conclusively that the benzene molecule is a flat ...