The shifting orbit of one of Saturn's moons indicates that the satellite has a subsurface ocean, contradicting theories that its interior is entirely solid. The finding calls for a fresh take on what constitutes an ocean moon. Millions of tonnes of 'red mud', a hazardous waste of aluminium production, are generated annually. A potentially sustainable process for treating this mud shows that it could become a source of iron for making steel. A design principle for buildings incorporates components that can control the propagation of failure by isolating parts of the structure as they fail ' offering a way to prevent a partial collapse snowballing into complete destruction. RNA-guided recombinase enzymes have been discovered that herald a new chapter for genome editing ' enabling the insertion, inversion or deletion of long DNA sequences at user-specified genome positions.
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