Whales are all large by any measure, but one group of them in particular, the baleen whales (Mysticeti), are especially large, and, interestingly, this group only became really big relatively recently. Why did they get so big? Ed Yong (on Twitter) writes about the rise of these majestic giants in a series of great articles here and here, based on two separate yet related studies by Slater et al. and Gearty et al.
When, in 1994, definitive evidence of tuberculosis in humans was reported from pre-Columbian America, it was a startling. Conventional understanding had pegged tuberculosis as part of the new, exotic, and (to immunologically-naive populaces) deadly menagerie of pathogens brought by Europeans over to the Americas. While there were suggestions of pre-Columbian tuberculosis in the Americans, these were based on lesions on bones, which were ambiguous. Unlike previous cases, however, the Chiribaya mummy from 1000-1300 CE in Peru was shown beyond doubt to have been exposed to tuberculosis:
A new fossil provides some insight into the critical K-PG boundary around which most modern bird lineages radiated: doi: 10.1073/pnas.1700188114
Some nice work that ties the timing of the radiation of three independent lineages of frogs, constituting the majority of modern living frogs, to about the time the major groups of dinosaurs took a hit (literally and figuratively!). Compelling and interesting story, with lots of intriguing follow-up questions. A more general article covering the findings is available here. Yan-Jie Feng, David C. Blackburn, Dan Liang, David M. Hillis, David B.
Walk deep into a rainforest at night. Switch off your headlamps. And wait with open eyes. At first, it is so pitch black that you cannot see your own hand if you wave it in front of nose (as Bilbo might have said). As your eyes get accustomed to the darkness, you will realize one thing. Everything glows. Everything. There is fine fuzzy layer of bioluminescent fungus covering dead leaves and the bark of trees, so you can almost make out the forest like some one has traced it out in ghostly yellow-green outline.