Each of us has enough DNA to reach from here to the sun and back, more than 300 times. How is all of that DNA packaged so tightly into chromosomes and squeezed into a tiny nucleus? Long, slender ...

Under the microscope in its extended form, chromatin looks like beads on a string. The beads are called nucleosomes. Each nucleosome is made of DNA wrapped around eight histone proteins that ...

Begin by stringing bronze beads onto a length of the fishing line. To keep the beads from sliding off, string a bead close to the end of the line and tie a knot around the bead. Then, string the ...