RESEARCH REDO Scientists repeated some important cancer biology studies, but didn’t always get the same answers. The replication experiments may help explain why some results don’t stand up to scrutiny.
HIGH HOPES Cannabis plants such as this one yield marijuana and other substances that deserve expanded study for possible medical benefits, a large research review recommends. But negative physical and psychological effects of cannabis products can’t be ignored, the report says.
TIME MACHINE The TARDIS, disguised as a police phone box, is the time machine used by Doctor Who, one of many examples of fictional time travelers described by James Gleick in his book Time Travel.