BRAIN TEASERS
Brain Teasers User Profile

Benjamin Woo

rank
613
points
0
See full ranking list
short ranking list
611. Benjamin Lopez 0
612. rudolpm morales jr 0
613. Benjamin Woo 0
614. Sarah Keene 0
615. RUPA BOPPANA 0
last 3 solved tasks

Camera obscura

In 1544, a solar eclipse was viewed at Louvain, which was later depicted in the first published book illustration of the camera obscura in use. Dutch mathematician and astronomer Reinerus Gemma-Frisius viewed a solar eclipse using a hole in one wall of a pavillion to project the sun's image upside down onto the opposite wall. He published the first illustrationof a camera obscura, depicting his method of observation of the eclipse in De Radio Astronomica et Geometrica (1545). Several astronomers made use of such a device in the early part of the 16th century. Both Johannes Kepler and Christopher Scheiner used a camera obscura to study the activity of sunspots. The technique was known to Aristotle (Problems, ca 330 BC).

Before

A sixth grade class is doing some spelling drills. The teacher asks Tommy if he can spell 'before.' He stands up and says, "Before, B-E-P-H-O-R."

The teacher says, "No, that's wrong. Can anyone else spell before?"

Another little boy stands up and says, "Before, B-E-F-O-O-R."

Again the teacher says, "No, that's wrong." The teacher asks, "Little Johnny, can you spell 'before'?"

Little Johnny stands up and says, "Before, B-E-F-O-R-E."

"Excellent Johnny, now can you use it in a sentence?"

Little Johnny says, "That's easy. Two plus two be fore."

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.