There's a lot in this talk. It's about chemicals and food and saving the environment by tricking your taste buds into thinking that the watermelon grown in some guy's back yard down the street is tuna transported from the Pacific Ocean 2500 miles inland.
What I'm taking from it today, though, is that your eyes can't always be trusted. You need to take in all the available information via all your available senses, and you need to process it through your brain, and then you can decide if you really have what you think you have.
Be careful, though, to not put yourself through an endless data processing loop. Make a decision, but make it a good one.