Global climate change: Earth nears dangerous tipping point

There’s a right time to stop an avalanche: before it really gets rolling. And there’s a right time to stop climate change: before it becomes irreversible, with multiple positive feedback cycles making widespread disaster and extinctions inevitable. Right now, we may only have five years to implement substantial changes in our greenhouse-gas emissions: Evidence of impending tipping point for Earth.

Math professor develops better car side-mirror

New mirror above standard mirror

R. Andrew Hicks, a mathematics professor at Drexel University in Philadelphia, has designed a mirror that shows a much wider field of vision and will eliminate the blind spot where side and rear-view mirrors fail to overlap. The mirror covers about 45°, compared to about 16° for the mirrors in use now. See New Side-Mirror.

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