Here is a question about this article: The nickname cule for a Barcelona supporter is derived from the Catalan cul (English: arse), as the spectators at the first stadium, Camp de la Industria, sat with their culs over the stand. In Spain, about 25% of the population is said to be Barca sympathisers, second behind Real Madrid, supported by 32% of the population. Throughout Europe, Barcelona is the favourite second-choice club. The club's membership figures have seen a significant increase from 100,000 in the 200304 season to 170,000 in September 2009, the sharp rise being attributed to the influence of Ronaldinho and then-president Joan Laporta's media strategy that focused on Spanish and English online media.
What is the answer to this question: What was the club membership in 2003-04?
****
So... 100,000

Here is a question about this article: The Cenozoic Era covers the 66 million years since the CretaceousPaleogene extinction event up to and including the present day. By the end of the Mesozoic era, the continents had rifted into nearly their present form. Laurasia became North America and Eurasia, while Gondwana split into South America, Africa, Australia, Antarctica and the Indian subcontinent, which collided with the Asian plate. This impact gave rise to the Himalayas. The Tethys Sea, which had separated the northern continents from Africa and India, began to close up, forming the Mediterranean sea.
What is the answer to this question: What geologic period are we in currently?
****
So... Cenozoic Era

Here is a question about this article: Most common glass contains other ingredients to change its properties. Lead glass or flint glass is more 'brilliant' because the increased refractive index causes noticeably more specular reflection and increased optical dispersion. Adding barium also increases the refractive index. Thorium oxide gives glass a high refractive index and low dispersion and was formerly used in producing high-quality lenses, but due to its radioactivity has been replaced by lanthanum oxide in modern eyeglasses.[citation needed] Iron can be incorporated into glass to absorb infrared energy, for example in heat absorbing filters for movie projectors, while cerium(IV) oxide can be used for glass that absorbs UV wavelengths.
What is the answer to this question: What property of thorium oxide has caused it to no longer be used in eyeglasses?
****
So...
radioactivity