Dinosaurs could not hear humans

If a Tyrannosaurus rex lived and crossed on our way, not hear our cries. This was confirmed by a study conducted by Otto Gteich and his team at the University of Regensburg in Germany.

To calculate the limits of hearing 7 rex, analyzed the ear of birds descended from dinosaurs. Scientists found that the frequency range of hearing in birds is inversely proportional to its body mass and length of their basilar papilla, a structure key to the inner ear.
Apparently, the species with small papillae Corlar better hear high frequencies. Because fossils do not preserve this part of the ear, experts measured through cloquear, that it is preserved in Archaeoptetyx-an early-bird, alosaurios and braquiosaurios.

In these fossils is that through third longer than the birds. In conclusion, concluded that the Archaeoptetyx had a hearing similar to modern birds.

For its part, a alosaurio of 1.4 tons oiria frequencies between 1.1 and 3 kHz, and a braquiosaurio of between 700 hertz and 2.4 kHz. The range of tyrannosaurus would be between the two. As the cry of a human exceeds 3 kHz, the animal could spend over without hearing our complaints.

Why sing in the shower?

There are people who enjoy singing in the shower mainly because it listens to itself very well.
This is because the shower works as a rudimentary recording studio: increasing the volume of sound, enhances the low and produces echo.
The tiles of the room reflect the sound over and over again in all directions, which boosts the intensity of the sound and provides a voice "potenle more."

The echo is achieved by the multitude of reflected waves that reach the ear at different times, which makes the sound of the melody is more full and rich.
Finally, the bathroom functions as a resonance chamber that amplifies the low frequencies.