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Despite increasing awareness of how critical sleep is to our health, getting a good night’s rest remains increasingly difficult in a world that’s always “on” — responding to emails at all hours, news cycles that change with every tweet and staring endlessly into the blue light of cell phone, tablet and computers screens.

Space cooling and heating is a common need in most inhabited areas.

In a new study, higher daily step counts were associated with lower mortality risk from all causes. 

In recent years, the attention of scientists and environmentalists has turned toward how population growth and urban expansion are driving habitat loss and an associated decline in ecosystem productivity and biodiversity. 

Scientists are preparing a massive computer model of the coronavirus that they expect will give insight into how it infects in the body.