IN NUM­BERS

Focus-Science and Technology - - Q&A -

16-20,000

Age, in years, of pre­his­toric ar­row­heads un­earthed in Gault, Texas. This means hu­mans had made their way into North Amer­ica at least 2,500 years ear­lier than was pre­vi­ously be­lieved.

1,400°C

The tem­per­a­ture that heat shields on NASA’s Parker So­lar Probe will need to with­stand. Al­though tem­per­a­tures in the corona reach mil­lions of de­grees, there’s very lit­tle mat­ter there, so the ac­tual heat­ing ef­fect is quite low.

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