And what country can preserve its liberties if their rulers are not warned from time to time that their people preserve the spirit of resistance? Let them take arms. The remedy is to set them right as to facts, pardon and pacify them. What signify a few lives lost in a century or two? The tree of liberty must be refreshed from time to time with the blood of patriots and tyrants.
Tuesday, February 25, 2014
Plants can be found in some of the most remote, inhospitable places on the planet, resulting in the evolution of creative ways to adapt to harsh environments. One adaptation used by plants are hairs, called trichomes (hydrangea trichomes seen here in this micrograph), that cover the surface of leaves. Trichomes help insulate the air surrounding leaf openings to increase humidity. They also shade from or reflect light to prevent water evaporating from leaf cells.