The northern cassowary (Casuarius unappendiculatus) also known as the one-wattled cassowary, single-wattled cassowary, or golden-necked cassowary, is a large, stocky flightless bird of northern New Guinea. It is one of the three living species of cassowary, alongside the dwarf cassowary and the southern cassowary. It is a member of the superorder Paleognathae. Taxonomy Edward Blyth first identified the northern cassowary from a specimen from an aviary located in Calcutta, India, in 1860. It is the most recently discovered of all the cassowary species. The genus name Casuarius is derived from the Malay word kesuari "cassowary", while the species name unappendiculatus refers to the species' single wattle. Officially, there are no subspecies, though some authors list several subspecies. Description The northern cassowary has a hard and stiff black plumage, blue facial skin and a casque on top of the head. It has a bright red or yellow coloured neck and wattle. The feet are huge and strong with long...

In vector calculus, the gradient of a scalar-valued differentiable function f {\displaystyle f} of several variables is the vector field (or vector-valued function) ∇ f {\displaystyle \nabla f} whose value at a point p ...

Mason Tony Mount (born 10 January 1999) is an English professional footballer who plays as an attacking or central midfielder for Premier League club Manchester United and the England national team. Mount began his senior club career with Chelsea, and joined Vitesse and Derby County on consecutive loans between 2017 and 2019. He established himself as an integral player for Chelsea in the following years, and won the UEFA Champions League, the UEFA Super Cup, and the FIFA Club World Cup in 2021. He was named Chelsea Player of the Year in the 2020–21 and 2021–22 seasons. Mount won the UEFA European Under-19 Championship with the England national under-19 team in 2017. He made his senior international debut in 2019, at age 20, and was part of the England team at UEFA Euro 2020 and the 2022 FIFA World Cup. Early life Mason Tony Mount was born on 10 January 1999, in Portsmouth, Hampshire, to parents Debbie and Tony Mount. His father, Tony, was a former non-league footballer who later coached local clubs, including Havant Town. As a child, Mount played locally for Boarhunt Rovers and...