We tried this, great fun: we got better results with dried things—peppercorns, coffee, and vanilla—over green—basil, cucumber, lemongrass—but passion fruit was the real surprise winner. We saw the non-electric version in Japan in 2007, so what’s 4 years to wait for a jellybean? Prof Wiseman said researchers suspected the best dancers would have the most symmetrical ears, while the worst dancers would be less equal – though there may only be a few millimetres difference.