1.   Bassett put the radioactive materials in syringes without telling doctors making the injections that they were injecting radioactive materials.

2.   It also makes carbon dioxide injection devices used to get more crude oil out of wells.

3.   Silberstein and Glogau suggested in interviews that the difference could lie in where the injections were made.

4.   The Manchester team has also converted the contraceptive into pills and patches and is working to make each injection last four months, instead of one week.