I never went to university <a href="http://www.sandbox.cardinalsystems.com.ar/stmap_eafa0.html?cialis.elavil.sotalol">pharmaroids.com</a>  (Phys.org) —In May 2009, the Mars rover Spirit cracked through a crusty layer of Martian topsoil, sinking into softer underlying sand. The unexpected sand trap permanently mired the vehicle, despite months ...