Answer:
They can be harbored, but few hold water. You can nurse them, but only by holding them against someone else. You can carry them, but not with your arms. You can bury them, but not in the earth.
As light as a feather, but you canβt hold it for ten minutes.
I am the greatest teacher out of them all, but alas in the end I kill my pupils.
I crawl on the earth. And rise on a pillar.
What kind of running means walking?
People take me on walks and I run and have fun. What am I?