Reintroduce the science category (Fixes #20)

This reverts commit 2e5a4a70.
2 jobs for !15 with science-category in 2 minutes and 9 seconds (queued for 2 seconds)
latest detached
Status Job ID Name Coverage
  Build
passed #13702
build

00:00:41

 
  Distcheck
passed #13703
distcheck

00:01:27