As soon as chemists have a definite conception of the internal structure of the molecule of an organic compound, they are able to tackle the task of producing these substances by artificial methods, i.e. by synthesis, as we call it.
Historians spend their days engaged in the literally endless task of reshaping and expanding our view of the past, while statues are fixed and inflexible.
Africa is the most weathered continent in the world; 75 percent of its soil has been degraded. You don't just bring that back. I always like to say it's like putting an oxygen mask on a cadaver; it just isn't going to work.