• A spacecraft that slingshots around Jupiter gains energy by slowing the planet in its orbit (16 March, p 10).
• The SPF rating of standard sunscreen is primarily a measure of protection against UVB rays (16 March, p 28).
• The “Düsseldorf patient” seems to be cleared of reproducing HIV virus, though a few tests gave positive signals. These may be false positives, non-infectious virus fragments, or whole virus that couldn’t reproduce because of a lack of susceptible immune cells (9 March, p 12).
