I have an existing driveway that is eight years old. Its dimensions are 30-by-60 feet. I just have a binder coat on the driveway. I also have some low spots that are 1 to 2 inches where the concrete garage floor meets the driveway. The driveway is sealed every two years with Jet Black seal coat. The driveway is in good condition overall with some minor cracks.
Two scientists, James Watson and Francis Crick, worked out the structure of DNA. By using data from other scientists they were able to build a model of DNA. The data they used showed that bases occurred in pairs.
Watson and Crick realized that DNA was made up of two chains of nucleotide pairs that encode the genetic information for all living things. Credits: Photo of Rosalind Franklin courtesy of Vittorio Luzzati. Photo of x-ray crystallography (Exposure 51) courtesy of King's College Archives. King's College London.