501总吨至2000总吨的部分，每总吨增加500计算单位；
New iron nanomaterial wipes out cancer cells without harming healthy tissue
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Debris actually pelts the ISS all the time, and noticeable dents and cracks line the exteriors. But should something fully breach the station, cabin atmosphere will seep into the vacuum of space and alarms will go off. Pressure gauges will confirm to astronauts that the station has, almost certainly, been hit, and the speed of the seepages may indicate how much time the crew has to respond. According to one NASA estimate, a 0.6-centimeter-wide hole leaves 14 hours to plug the leak. A 20-centimeter hole leaves less than a minute.，这一点在safew官方版本下载中也有详细论述
After reboot, we see that nginx is indeed installed… but cowsay is gone!