<span>Stephen Hawking uses a speech generating device that he is able to work with a sensor in his mouth. The sensor is able to take his muscle movements and translate them into words. Intel has created something called SwiftKey which has enhanced this sensor to predict whole words and generate them with more clarity and more accurately.</span>
The sponge is a very porous structure, while the soap us more solid.
Not enough detail.
One way is the verbal Rating of perceived exertion scale 6-20
Another is heart rate range compared to their Max heart rate 220-age
I believe it is metaphor, but i am not a 100% sure
Vitamins and proteins are essential for health protection