One plan was to burn the surface oil with a substance similar to napalm.

Understanding the difference between these very similar substances will be an early challenge for researchers.

This is usually done by delivering nicotine (or a substance very similar to it) in other ways.

"Two oddly similar substances, come to think of it - and both of them hell on your children."

The show hunter: similar to the show pony, but with more substance.

A similar substance made from wood by heating it in an airless space is called charcoal.

This text went on to serve as a central source for knowledge on herbs and similar medical substances.

A similar substance issued from the lips of his brothers.

Hawks pressed into it as directed and felt a similar substance close behind him.

Shields were generally made of wood, covered with leather, or some similar substance.