JD.com crowdfunded success, can Korbel become the "millet" in the coffee machine?

According to a recent report on the US website MSNBC, an interesting study has been published in the journal Experimental Psychology. The researchers recruited a group of college student volunteers and asked them to randomly take a capsule containing 100, 200 or 400 milligrams of caffeine and no caffeine at all. After taking the capsule for 45 minutes, ask them to read an article and find out the spelling and grammatical mistakes in it.