Bioaccumulation occurs when a substance becomes concentrated inside the body of a living thing. It happened with DDT.

David Tilton and Lynn Silva were out making their typical derby rounds Friday afternoon when they came across a whale in 20 to 25 feet of water just off the Brickyard on the Chilmark north shore.

Salt marshes are among the most productive ecosystems on earth. But many are threatened due to erosion and sea level rise. At Sengekontacket a group effort is taking place to mitigate erosion and monitor changes.

If the weather is clear, Sunday night will open with a brilliant harvest full moon rising over Chappaquiddick. But then the moon will fade as Vineyard skywatchers experience a lunar eclipse. The show begins just after 10 p.m.

The brilliant planet Venus is high in the southeastern sky before sunrise. You don’t have to get up too early to see it.

All year long we talk about September as a great time for birds. This is because of migration and the probability of unusual birds showing up.