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.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): What animals cause the reddish-brown streaks of color in hickory wood?
Ah, so.. birds

Relationships between religious groups are generally amicable, although there is some concern among mainstream Muslim leaders[who?] that minority religious groups undermine national unity. There is a concern for religious institutions becoming active in the political sphere. The Islamic Renaissance Party (IRP), a major combatant in the 1992–1997 Civil War and then-proponent of the creation of an Islamic state in Tajikistan, constitutes no more than 30% of the government by statute. Membership in Hizb ut-Tahrir, a militant Islamic party which today aims for an overthrow of secular governments and the unification of Tajiks under one Islamic state, is illegal and members are subject to arrest and imprisonment. Numbers of large mosques appropriate for Friday prayers are limited and some[who?] feel this is discriminatory.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): What type of religions concerns are there?
Ah, so.. minority religious groups undermine national unity

Glass has the ability to refract, reflect, and transmit light following geometrical optics, without scattering it. It is used in the manufacture of lenses and windows. Common glass has a refraction index around 1.5. This may be modified by adding low-density materials such as boron, which lowers the index of refraction (see crown glass), or increased (to as much as 1.8) with high-density materials such as (classically) lead oxide (see flint glass and lead glass), or in modern uses, less toxic oxides of zirconium, titanium, or barium. These high-index glasses (inaccurately known as "crystal" when used in glass vessels) cause more chromatic dispersion of light, and are prized for their diamond-like optical properties.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): What are high-index glasses erroneously called?
Ah, so..
crystal