Konyukhov flew by helicopter back to Northam, where his first shower in 11 days was a priority.

Mr. Roosegaarde said the idea for the Smog Free Tower came about during a 2013 trip to Beijing, when he learned the blanket of smog was so bad that the city’s children could not play outdoors for part of the year.

Because each chlorine in atom is surrounded by other chlorine atoms, they remain stable and stationary. Previous attempts to encode data on the atomic scale have relied on loose, unanchored atoms.

A baby’s health has long been considered the mother’s responsibility as soon as she falls pregnant. But little attention has been paid to how a father’s health might impact his unborn child.

While an invisibility device sounds like something that should be confined to a section labeled “children’s toys,” there is a wide range of important uses for it, should it finally come to fruition.