Loggers need to control their appetite for slow-growing trees to spare the Amazon rainforest from deforestation.

A new study by Ph.D. student J. Aaron Hogan points to changes in tree composition in a long-term study site in French Guiana to sound the alarm.

“We’re approaching a threshold where we’re forced to make some difficult decisions,” Hogan said. “Do we feed into demand for these tropical hardwoods? Or do we stick to our guns and say you can’t log any more until this stand is regenerated.”

Australia’s population clock is, according to the Australian Bureau of Statistics, steadily ticking away at an overall total population increase of one person every 1 minute and 23 seconds. It’s set to tick over to 25 million around 11pm tonight.

Many are debating what the ideal population is for a country like Australia. But because most of this population growth is concentrated in our big cities, perhaps we should be thinking less about that and more about the ideal size of a city. Historically, there have been many theories on what this would be.

The object has caught scientists’ eyes by being strange in multiple different ways.

You’re never too old to live young so long as you put forth effort.

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This 63-year-old is showing up people half his age.

Credit: Gerry Mansolill

Some of us will look back on the technology we’re using right now, and it will seem like the stone age.

Why it matters: “With rising populations, growing mega-cities, and rapid global travel that saw more than 1 billion international tourist arrivals in 2015 alone — a new strain of deadly flu will make 1918 look like a walk in the park.”