The coaster brake is one of the three types of braking mechanism developed to slow down and stop a bike safely and efficiently. This mechanism quickly gained in popularity in the USA, Germany and the Netherlands in the 1890s and is still used for upright and children's bicycles.

These pullets are from an April hatch.

As a consequence, interlayer-substituted barlowite can be described by a simple two-parameter Heisenberg Hamiltonian, for which a quantum spin liquid ground state has been predicted..

Among the 922 cases investigated as listed in Table 5, 43.28 percent had second births within two years, and 67.03 percent within three years. And those who had second births when their first born children were only one year old accounted for 15.47 percent in Yang County, 30 percent in Yanchuan County, 15.68 percent in Mizhi County, and 20.41 percent in Jintai District of Baoji.