Is energy conserved? "Of course it is!" anyone with just a rudimentary knowledge of physics will answer. A more pertinent answer would be: "if you can't show me a working perpetual motion machine, shut up and stop wasting my time!" 

The conservation of energy is an insight that stood the test of time. It was Julius von Mayer who first worded it in its clearest form: "Energy can be neither created nor destroyed". That was nearly 170 years ago. 

So why question energy conservation?

The interesting thing about physics is that the deeper you dig, the more you are forced to doubt existing principles. Dig deep into the universe, allow gravity to become a dominant feature, and the conservation of energy becomes much less obvious. 

What happens when you think you have seen a recent collision between two asteroids but find a bizarre X-shaped object at the head of a comet-like trail of material?    You keep looking until you can figure it out.

In January, astronomers thought the new collision they found would have a debris field expanding rapidly, like shrapnel flying from a hand grenade, but when they watched the aftermath using Hubble, they found the opposite; the object was expanding very, very slowly and that it started, not a few days, but nearly a year before the January observations.

Can't decide between the opera and a football game? (If needed, replace these bland stereotypes with specifics from your own relationship). Game Theory's got your back.

Imagine the possible outcomes: football together, football alone, opera together, and opera alone. We can show this with the following grid (imagine the guy choosing a column and the lady choosing a row—they accept the outcome that gets two marks):

Chiquita Brands has announced that following years of intensive research and investment,  FreshRinse(TM) technology is ready to go.  

Yes, for those of you who can't be bothered to wash even your pre-packaged salad, this can be a real time saver.    Their claim; it dramatically reduces microorganisms on leafy greens and better maintains freshness.

They claim that FreshRinse(TM) is a scientifically validated advancement for fresh produce safety that delivers a substantial reduction in microorganisms on leafy greens, including superior microbial efficacy against such pathogens as Salmonella, Listeria monocytogenes and E. coli O157:H7, as compared to the industry's conventional chlorine sanitizers.