Shares in enterprise resource planning (ERP) vendor JD Edwards fell last week after the resignation of its chief executive.
Doug Massingill quit after less than 18 months in the job, with no reason given for his shock departure.
Edward McVaney, the company's founder, will take on the position of chief executive.
Some parts of Atacama have not received rainfall for 500 years - but a sudden deluge of water upset the Desert's delicate biological balance
Spitzer Space Telescope could not spot Oumuamua, suggesting that it is actually pretty small
Greenland crater one of the 25 largest impact craters on Earth
This long-sought progenitor star was identified in an image captured by Hubble in 2007