- Live views from the International Space Station are streaming from an external camera mounted on the station’s Harmony module. \ The camera is looking forward at an angle so that International Docking Adapter 2 is visible. If the Harmony module camera is not available due to operational considerations for a longer period of time, a continuous loop of recorded Earth views will be displayed with the caption “Previously Recorded.”
- Chemical bond (Wikipedia)
A chemical bond is the association of atoms or ions to form molecules, crystals, and other structures. The bond may result from the electrostatic force between oppositely charged ions as in ionic bonds or through the sharing of electrons as in covalent bonds, or some combination of these effects. Chemical bonds are described as having different strengths: there are “strong bonds” or “primary bonds” such as covalent, ionic and metallic bonds, and “weak bonds” or “secondary bonds” such as dipole–dipole interactions, the London dispersion force, and hydrogen bonding.