Uploaded March 2020 | Updated September 2026, 1 week ago
My grand-daughter Lena (at age 1) tests hypotheses all day long. That's what scientists do also, and we enjoy it just as much as Lena does.
My grand-daughter Lena (at age 1) tests hypotheses all day long. That's what scientists do also, and we enjoy it just as much as Lena does.










