Most people would agree that fossil fuels simply need to go. They’re the cause of pollution, wars and climate change. Thankfully, scientists have been researching alternative energy solutions like wind and solar power for years.

But wind and solar are still more expensive than oil and coal, and may not be the best solution for all places or uses. For example, some medical devices that are implanted in a human body could benefit from super tiny batteries that last decades.

So, scientists are continuing the quest for abundant, cheap and efficient energy by investigating lesser-known sources, ones that may seem a little unusual, even ridiculous, unrealistic, and in some cases, morbid.

“I think in order to solve the impending energy needs we might have to go a bit beyond,” said Bobby Sumpter, a senior research scientist of computational theoretical chemistry at Oak Ridge National Laboratory.

Here are 11 of the more unusual sources that go above and beyond the norm. Who knows. One day, you may use sugar to power your laptop, bacteria to run your car or dead bodies to heat a building.