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In the last weeks street protests in Brazil have erupted not only in São Paulo and Rio de Janeiro, but also in small towns across the country.
What was initially a march against bus-fare increase in São Paulo became a much broader – multi- or non-partisan – protest against corruption and millionaire investments in soccer stadium infrastructure in preparation for the 2014 World Cup. Many Brazilians perceive this as exorbitant spending, a shocking contrast with lack of public security, deficient education and health system, and unreliable public transportation they have to face everyday.
Here is a collection of sounds from the protests. Please help me expand this audio collection!
Rio de Janeiro
June 18, 2013:
In the metro station, singing the national anthem (June 18, 2013):
Also in the metro station, same day:
“Male frogs call to attract females for mating and to defend territories from rival males. Female frogs of some species prefer lower-pitched calls, which indicate larger, more experienced males. Acoustic interference occurs when background noise reduces the active distance or the distance over which an acoustic signal can be detected. Birds are known to call at a higher pitch or frequency in urban noise, decreasing acoustic interference from low-frequency noise. Using Bayesian linear regression, we investigated the effect of traffic noise on the pitch of advertisement calls in two species of frogs, the southern brown tree frog (Litoria ewingii) and the common eastern froglet (Crinia signifera). We found evidence that L. ewingii calls at a higher pitch in traffic noise, with an average increase in dominant frequency of 4.1 Hz/dB of traffic noise, and a total effect size of 123 Hz. (more…)
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