Because it's THE mechanism of how the sun's energy enters life. Without it we'd all be dead.

I envy plants for being capable of doing this. That's the kind of freedom I'd like to have. To just sit in the sun, drink water and do nothing.

Photosynthesis > Bitcoin

I've actually had many times I was seriously challenged on this topic.
Once I remember by my physics teacher when I was 13. He asked the question I was the only one to respond with: photosynthesis. He approached me in desbelief and asked whether I had an older smart brother. I don't have any siblings.

Second was in university when I was taking a course in biofuels. The teacher asked, "We all know chlorophyll as the main photosynthetic molecule. But there's another one. Anybody?"

I was the only student who instantly raised his hand and I blurted out: "carotenoids".
A student behind started laughing out loud and said derisively, "OMG man, are you serious? That shit's in carrots."

I felt so stupid for having answered the teacher's question so quickly. Was I an idiot for saying it. Why didn't I think longer on this instead of just opening my mouth so quickly. I felt so embarassed.

But the guy went on laughing, and the teacher remained quiet. When the ridicule and laughter was done, he flipped the power point slide and it spelled: CAROTENOIDS.

Best day of my life.

I eventually took an honours course in Molecular Photosynthesis and had a 90% score.