Short answer: a boatload.
It wasn't because he was absent-minded; Big Al had a reason.
A possible answer for the why-haven't-we-seen-them question.
"Epic" is overused, but this is pretty big.
The authors regret that there is an error in the published version of “Correlation not Causation: The Relationship between Personality Traits and Political Ideologies” American Journal of Political Science 56 (1), 34–51. The interpretation of the coding of the political attitude items in the descriptive and preliminary analyses portion of the manuscript was exactly reversed.
The scientist who discovered the mystery is trying to raise money on Kickstarter to resolve it. This article in Scientific American explains.
Related: another big physics mystery is discussed in "Is Particle Physics About to Crack Wide Open?".
"Lost colonies found in a data mine: Global honey trade but not pests or pesticides as a major cause of regional honeybee colony declines"
Oh, my. You mean it's not an environmental disaster?
Recent losses of honeybee (Apis mellifera) colonies have been linked to several non-exclusive factors; such as pests, parasites, pesticides (e.g., neonicotinoids) and other toxins. Whereas these losses pose a threat to apiculture, the number of globally managed colonies appeared to be less affected because beekeepers replace lost colonies. From a socioeconomic and ecological perspective the number of managed colonies is arguably more relevant when addressing the issue of apiculture and pollination services provided by honeybees. We here use the FAO data base to dissect the interactions between the global honey market and the number of colonies. Global scale analyses do not show a general colony decline. Whereas Western Europe and the US show suffer colony declines, other regions show considerable increase. We could not find any link between the colony dynamics and the occurrence of specific pathogens or the use of pesticides. In contrast, changes in the political and socioeconomic system show strong effects on apiculture. In addition, many countries show a tight negative correlation between honey import and the number of managed colonies. For some countries, the amount of honey produced per colony is highly positively correlated with the amount of honey imports, and we cannot exclude large scale relabeling of imported to nationally produced honey. It is very clear that honey trade is a dominating factor for the number of managed colonies since countries with a strong import and export ratio are those suffering most strongly from colony declines.
Something I noticed, too.
I was looking recently on Google Scholar at who cited me, and a recent citation I got was from a phd thesis from some for-profit school (probably online), in some clown-ass field like "organizational social international management." The person clearly has no idea what they are citing. Not like they just don't understand the paper, they clearly just picked my paper to put in as a citation so it looked like they actually did research.
Famed Princeton mathematician Persi Diaconis and co-authors say, "No."
For all your prime number needs. Including, should you want them, the first 50,000,000 primes.