I walk a lot. Around 4 millions steps a year.

She wasn’t on the board of directors of IBM, she was on another board which the CEO of IBM was also on.

It’s a distinction without a difference, but still.

Hazard perception is hard af at first.

I did it in 25 hours at £30 per hour.

Everybody is different and learns thing at different paces. I also did automatic only so that makes it easier.

The theory was the one for me. Couldn’t bring myself to study, damn ADHD, but I do have general common sense and I pick up things from the environment so I figured I could just hope I got questions I knew. Failed once then passed next one.

I got curious and your assumption is correct for one of the limiting factors.

Here is what I found:

• The shell must be strong enough to support the egg’s weight and protect the embryo, but thin enough for the chick to break through when hatching.
• As size increases, the weight grows cubically (volume), but shell strength only increases quadratically (surface area), so there’s a point where the shell would have to be too thick to hatch from.
• The distance from the shell to the center increases.
• Oxygen diffusion becomes inefficient, and the embryo could suffocate.
• Larger eggs are harder to keep at a uniform temperature.
• Birds incubating the eggs would need to generate and distribute more heat, which is physically demanding.