Why are bad habits so hard to kick?

Why are bad habits so hard to drop? Are we in a new industrial revolution? Why don't islands have snakes? How do drugs know where to go? Would fireworks work on Mars? Which foods cause inflammation? Why can't we harness power from. The Earth's magnetic field? How does sepsis get into the body? Should you avoid steroids? Do masks affect learning development in children? Dr Chris and Clarence Ford have the answers... Like this podcast? Please help us by supporting the Naked Scientists