Trust me on this - PCR
or...
The Internet is another good choice – because it allows for the rapid searching and dissemination of information.
In the ‘good old days’, Biologist had to go to a library and trudge through hundreds of journal articles to find one they might need. Now, most journals are online (w/ a subscription), and you can do keyword searches from a computer.
True story – once I was trying to get DNA into a bacteria using electricity (long story). It would never work, no matter what I would do – I cold never get a transformation. Anyhow, in desperation I used Google, and found a journal article within 5 minutes that told me exactly what the problem was and how I needed to fix it.
I could go on and on with other examples – but the point is still the same – the Internet is the best thing to happen in the field of Biology since the graduated cylinder.