Brain Teasers User Profile

pravin Kumar

See full ranking list
short ranking list
186. Joe Smith 13
187. Anil Rajyaguru 13
188. pravin Kumar 13
189. elvis lungu 12
190. Je Re 12
last 3 solved tasks
If 4a5ab + 76ba4 = 1c64ac find number abc. Multiple solutions may exist.
If a2113 + 5aacb = 9c5b1 find number abc. Multiple solutions may exist.
If c06c2 - 6041a = 102b4 find number abc. Multiple solutions may exist.

Aleksandr Onufriyevich Kovalevsky

Died 22 Nov 1901 at age 61 (born 19 Nov 1840). Russian founder of comparative embryology and experimental histology, who first established that there was a common pattern in the embryological development of all multicellular animals. He studied the lancelet, a fish-shaped sea animal; about 2-in. (5-cm) long; then wrote Development of Amphioxus lanceolatus (1865). Then, in 1866, he demonstrated the similarity between Amphioxus and the larval stages of tunicates and established the chordate status of the tunicates. In 1867, Kovalevsky extended the germ layer concept of Christian Heinrich Pander and Karl Ernst von Baer to include the invertebrates, establishing an important embryologic unity in the animal kingdom. This was important evidence of the evolution of living organisms.a.k.a. Alexander Onufrievich Kovalevski. 19 Nov 1849 and 22 Nov 1901 (new style) are 7 Nov 1840 and 9 Nov 1901 (old style). Image: tunicate tadpole larva (L) and lancelet, Amphioxus (R).

A Moral Question

One man said to another, "I didn't sleep with my wife before I got married. How about you?"
The man replied, "I don't know. What was her maiden name?"

Jokes of the day - Daily updated jokes. New jokes every day.
Follow Brain Teasers on social networks
This site uses cookies to store information on your computer. Some are essential to help the site properly. Others give us insight into how the site is used and help us to optimize the user experience. See our privacy policy.