While the illustration may have moved some investors from zero to a token weight in foreign, many investors and advisors fixed on the optimum point at 20 to 30 percent as a maximum foreign weighting.

FORBES: How Much International?

Earlier work by Dr Schlenker has showed that plants have skewed preferences: they dislike temperatures beyond the optimum more than they dislike temperatures below the optimum, so increasing warmth can have worsening effects beyond a certain point.

ECONOMIST: Climate change and crops

"By incorporating Seagate's SSHD technology into our product offerings we are able to address customer demand for greater speed, shorter boot up and response times, optimum storage capacity and better battery life, all at a lower price point, " said Jerry Gross, vice president, Lenovo global procurement.

ENGADGET: Seagate ships its first desktop hybrid drive, third-gen laptop models