Open letter to South Africa’s students‚ universities and government‚ represented by Minister in the .
Rihanna, left, remains queen of the US pop charts after securing the top spot in the Billboard Hot 100 countdown for the seventh successive week.
The Barbados-born beauty's summer anthem Umbrella keeps Plain White T's Hey There Delilah from number one, while Fergie climbs to three with Big Girls Don't Cry.
The Black Eyed Peas star also claims the new Pop 100 top prize, giving Fergie the distinction of becoming the first female artist to score four number ones on that chart.
Rapper TI has scored the chart's top debut - his Wyclef Jean collaboration You Know What It Is. - Wenn