Notebook

Space

50 years ago, Earth’s chances of contacting E.T. looked slim

In 1973, a researcher calculated that it could take millions of years to contact aliens. But that hasn’t stopped scientists from trying.

Oceans

50 years ago, scientists discovered the Great Pacific Garbage Patch

In 1973, plastic bottles adrift in the North Pacific alarmed scientists. Fifty years later, more than 1.8 trillion pieces of plastic litter the area.

Science & Society

Many plans for green infrastructure risk leaving vulnerable people out

Green infrastructure is one way to help combat climate hazards like flooding. But without equitable planning, only some communities will benefit.