Rats for freedom
Rat-catchers beware: the rodents can learn to release one another from plastic traps, sticking to the task even when a tempting chocolate treat was placed nearby to distract them (Science, ).
Haemophilia therapy
Gene therapy has reduced symptoms of haemophilia B – a disorder that results in abnormal blood clotting. Six people with the disease received a gene that codes for an enzyme important in blood coagulation. Levels of the gene rose from less than 1 per cent of normal levels to between 2 and 12 per cent, and episodes of spontaneous blood loss were…
