C4 explosive found at Miami port?

CNN is reporting the following:
A suspicious device found at the Port of Miami has tested postive for C-4 explosive, police say.
Very strange given that just in the last couple of days, a few middle eastern men were held for questioning because of papers and cargo and such not being in order. They said they were [...]

‘New stem cell source’ discovered

Stem cells taken from the fluid that fills the womb in pregnancy could be used to create new brain, bone and liver cells, a study suggests.
US researchers successfully extracted the amniotic cells from samples, and then grew them in lab experiments.
Writing in Nature Biotechnology, they said it should be possible to harness the cells’ ability [...]