Now, after years of investigation, multiple lawsuits, and an online petition that has drawn more than 166,000 signatures, the pathologist who performed her autopsy says he has changed his mind.Dr.

Now, after years of investigation, multiple lawsuits, and an online petition that has drawn more than 166,000 signatures, the pathologist who performed her autopsy says he has changed his mind.Dr.

On 17 February 1869, Russian chemist Dmitri Mendeleev jotted down the symbols for the chemical elements, putting them in order according to their atomic weights and inventing the periodic table.

The modern periodic table, arranged in rows and columns, was first introduced by Dmitri Mendeleev in 1869. At the time, it included the known elements and their properties, but Mendeleev predicted ...