Input: Article: Abnormal discoloration of wood often denotes a diseased condition, indicating unsoundness. The black check in western hemlock is the result of insect attacks. The reddish-brown streaks so common in hickory and certain other woods are mostly the result of injury by birds. The discoloration is merely an indication of an injury, and in all probability does not of itself affect the properties of the wood. Certain rot-producing fungi impart to wood characteristic colors which thus become symptomatic of weakness; however an attractive effect known as spalting produced by this process is often considered a desirable characteristic. Ordinary sap-staining is due to fungal growth, but does not necessarily produce a weakening effect.

Now answer this question: What causes the black checked pattern in the wood of western hemlocks?

Output: insect attacks

Input: Article: Another popular event held in February, which is early spring in Tucson, is the Fiesta de los Vaqueros, or rodeo week, founded by winter visitor, Leighton Kramer. While at its heart the Fiesta is a sporting event, it includes what is billed as "the world's largest non-mechanized parade". The Rodeo Parade is a popular event as most schools give two rodeo days off instead of Presidents Day. The exception to this is Presidio High (a non-public charter school), which doesn't get either. Western wear is seen throughout the city as corporate dress codes are cast aside during the Fiesta. The Fiesta de los Vaqueros marks the beginning of the rodeo season in the United States.

Now answer this question: How much time do Tucson schools give students off to attend the Fiesta de los Vaqueros?

Output: two rodeo days off

Input: Article: Soon after, a Russian cavalry movement was countered by the Heavy Brigade, who charged and fought hand-to-hand until the Russians retreated. This caused a more widespread Russian retreat, including a number of their artillery units. When the local commanders failed to take advantage of the retreat, Lord Raglan sent out orders to move up. The local commanders ignored the demands, leading to the British aide-de-camp personally delivering a quickly written and confusing order to attack the artillery. When the Earl of Cardigan questioned what they referred to, the aide-de-camp pointed to the first Russian battery he could see the wrong one.

Now answer this question: Who countered the Russian cavalry's movement?

Output:
Heavy Brigade