(Left to right): Tobias Bernhard Raff/Minden Pictures; Thomas Hafeneth/creative commons; Image courtesy of Sean Murtha

Top stories: A killer cell transplant and the secret to reducing your carbon footprint

A stem cell transplant helped beat back a young doctor’s cancer. Now, it’s assaulting his body

A few months before completing medical school in 2003, Lukas Wartman was diagnosed with acute lymphoblastic leukemia, a blood cancer that’s particularly lethal when it strikes adults. So began a battle to stay alive that has involved more than 70 drugs and a staggering series of twists and turns, including a stem cell transplant that almost killed him.

The best way to reduce your carbon footprint is one the government isn’t telling you about

Recycling and using public transit are all fine and good if you want to reduce your carbon footprint, but to truly make a difference you should have fewer children. That’s the conclusion of a new study in which researchers looked at 39 peer-reviewed papers, government reports, and web-based programs that assess how an individual’s lifestyle choices might shrink their personal share of emissions.

‘Replication grants’ will allow researchers to repeat nine influential studies that still raise questions

Is experimenting with e-cigarettes among young people associated with a higher risk of smoking tobacco? Can exposure to a natural environment help you recover from stress? We may soon have fresh answers to those questions, thanks to the first research fund specifically dedicated to replication studies. The Dutch Organization for Scientific Research this week announced the scheme’s first nine grantees; all of them plan to replicate a study that had a major impact in their field but also raised questions—or eyebrows—for some reason.

Tiny fossil reveals what happened to birds after dinosaurs went extinct

The fossils of a tiny bird found on Native American land in New Mexico are giving scientists big new ideas about what happened after most dinosaurs went extinct. The 62-million-year-old mousebird suggests that, after the great dino die-off, birds rebounded and diversified rapidly, setting the stage for today’s dizzying variety of feathery forms.

New Zealand aims to eradicate invasive predators, but winning public support may be big challenge

A year ago, the New Zealand government announced a bold plan to rid the country of a trio of invasive predators—brush-tailed possums, rats, and stoats—that threatens native birds. Experts say the task will require new technologies that have yet to be invented, including deadlier toxins and possibly even the release of genetically modified organisms. But winning public support for these new methods could be an even bigger task, scientists say.