The 6th-grade science teacher, Mrs. Parks, asked her class, “Which human body part increases to ten times its size when stimulated?”

No one answered until little Mary stood up and said, “You should not be asking sixth-graders a question like that! I’m going to tell my parents, and they will go and tell the principal, who will then fire you!”

Mrs. Parks ignored her and asked the question again, “Which body part increases to 10 times its size when stimulated?”

Little Mary’s mouth fell open. Then she said to those around her, “Boy, is she going to get in big trouble!”
The teacher continued to ignore her and said to the class, “Anybody?”

Finally, Little Johnny stood up, looked around nervously, and said, “The body part that increases 10 times its size when stimulated is the pupil of the eye.”

Mrs. Parks said, “Very good, Johnny,” then turned to Mary and continued: “As for you, young lady, I have three things to say: One, you have a dirty mind. Two, you didn’t read your homework. And three, one day you are going to be very, very disappointed.”

Curtiss Pusher

Ride along with a restored, 1909 Curtiss Pusher aircraft:

The airspeed indicator appears to be an ultralight-style indicator. It shows airspeed from ram air as it moves through the air. Low-tech and very lightweight, but I’d imagine it will impart a small amount of drag. Not nearly as much as, oh, the rest of the aircraft’s rigging would.

Also, the two strings hanging from the trailing edge of the upper canard share maritime term but have a different purpose and position: telltales.

On sailboats, telltales are typically on the face of the sail and help to indicate whether the sail is in need of trimming or adjustment.

On aircraft, they indicate to the pilot whether the aircraft is in a slip. On some aircraft, they’re part of the avionics and are required!

There’s even more about this aircraft here.