Is it bad to swallow wood?

Score: 4.9/5 (63 votes) A new case study in the New England Journal of Medicine looks at the dangers. When swallowed, the small wooden or plastic objects...

What do you mean by xerogel?

Score: 4.6/5 (40 votes) : a solid formed from a gel by drying with unhindered shrinkage — compare aerogel. What is xerogel used for? SiO(2) xerogels are ...