41K views · 481 reactions | Bán lô mai lùm tàng thông 30 cây. Giá sỉ hết lô 150k/1 cây . (Loại nhỏ) chưa bao gồm tiền ship ( đã bán hết) | Mai Bình Định - Rẻ Đẹp Độc - Vườn Mai Bonsai 9 Mà | Facebook

3.1K views | In honor of Women’s History Month, we’re celebrating the...

In 1813 a Shaker woman named Tabitha Babbitt in Harvard Massachusetts changed the world with an invention she did not keep for herself but instead gave to all. While watching men work with a two man pit saw that wasted energy on the return stroke, she used her spinning wheel and a notched tin disk to create a circular saw powered by continuous motion. Her simple observation sparked an idea that spread quickly and helped build a nation. | History Vault