Circa 1500:
Portuguese explorer
discovers Brazil

Portuguese explorer Pedro Álvares Cabral landed near present-day Pôrto Seguro, Brazil, while tracing Vasco da Gama's 1497–99 route to India.

1921: SC Bose
quits civil services 

Subhash Chandra Bose resigned from the Indian Civil Service under the British regime and later joined the independence movement.

1970: First
Earth Day

The first Earth Day was celebrated after peace activist John McConnell’s proposal to UNESCO seeking a day to honor Earth. 

1977: Optical
fiber first used

Optical fiber was used to carry live telephone traffic for the first time.

2016: Paris
Agreement signed 

More than 170 countries signed the Paris Agreement on climate change, resolving to cut greenhouse gas concentrations. 

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