Stopping Sound with Foam. Experiments with this foam (shown under a microscope) showed that at certain frequencies, the bubbles and the surrounding liquid vibrate out of synch in response to an ultrasound wave, completely suppressing the transmission of sound. (Via APS physics).
Letter from Francis Crick to his son Michael, 1953
19 Portugal Place Cambridge
19 March ’53
My Dear Michael,
Jim Watson and I have probably made a most important discovery. We have built a model for the structure of de-oxy-ribose-nucleic-acid (read it carefully) called D.N.A. for short. You may remember that the genes of the chromosomes — which carry the hereditary factors — are made up of protein and D.N.A.
Our structure is very beautiful. D.N.A. can be thought of roughly as a very long chain with flat bits sticking out. The flat bits are called the “bases”. The formula is rather like this. […]
[…] In other words we think we have found the basic copying mechanism by which life comes from life. The beauty of our model is that the shape of it is such that only these pairs can go together, though they could pair up in other ways if they were floating about freely. You can understand that we are very excited. We have to have a letter off to Nature in a day or so. Read this carefully so that you understand it. When you come home we will show you the model.
Lots of love, Daddy
Sent by Marlareznor, see in their blog the original manuscript and a full transcription of the letter.
I have no dress except the one I wear every day. If you are going to be kind enough to give me one, please let it be practical and dark so that I can put it on afterwards to go to the laboratory.
More than a thousand end caps that make up this Rice University logo represent a fraction of those surveyed by Rice researchers who determined that the energies employed in cap formation do not contribute to the chirality of carbon nanotubes. Chirality refers to the angle of hexagons in nanotubes and dictates their electronic and other desirable properties.
Credit: Evgeni Penev