Dark matter is an enigmatic invisible substance supplying five-sixths of the matter of the universe. In 1922, Dutch astronomer Jacobus Kapteyn studied the motion of stars neighbouring the Sun and concluded the density of “dark matter” must be 0.0003 solar masses per cubic light year. Now, since we know the local density of dark matter, the value of the unknown …
The Proton Clinical Research Center at Shandong Cancer Hospital affiliated with Shandong First Medical University has successfully treated more than 300 cancer patients with proton therapy over the past five months and achieved remarkable results. Notably, it has "Precision particle therapies, such as proton therapy, can help treat most childhood cancers, including those in the brain stem," Yu said. But …
