He writes that "Buss and Shackelford (1997a) proposed seven adaptive problems our ancestors recurrently faced that might have been solved by aggression: co-opting the resources of others, defending against attack, inflicting costs on same-sex rivals, negotiating status and hierarchies, deterring rivals from future aggression, deterring mate from infidelity, and reducing resources expended on genetically unrelated children. "Goetz writes that most homicides seem to start from relatively trivial disputes between unrelated men who then escalate to violence and death. He argues that such conflicts occur when there is a status dispute between men of relatively similar status. If there is a great initial status difference, then the lower status individual usually offers no challenge and if challenged the higher status individual usually ignores the lower status individual. At the same an environment of great inequalities between people may cause those at the bottom to use more violence in attempts to gain status. Media
Research into the media and violence examines whether links between consuming media violence and subsequent aggressive and violent behaviour exists. Although some scholars had claimed media violence may increase aggression, this view is coming increasingly in doubt both in the scholarly community and was rejected by the US Supreme Court in the Brown v EMA case, as well as in a review of video game violence by the Australian Government (2010) which concluded evidence for harmful effects were inconclusive at best and the rhetoric of some scholars was not matched by good data.
Sclerodactyly
Though it is the most easily recognizable manifestation, it is not prominent in all patients. Thickening generally only involves the skin of the fingers distal to the metacarpophalangeal joints in CREST. Early in the course of the disease, the skin may appear edematous and inflamed. Eventually, dermal fibroblasts overproduce extracellular matrix leading to increased tissue collagen deposition in the skin. Collagen cross-linking then causes a progressive skin tightening. Digital ischemic ulcers commonly form on the distal fingers in 30–50% of patients. Telangiectasias
Marked telangiectasias (dilated capillaries) occur on the skin of the face, the palmar surface of the hands, and the mucous membranes. Telangiectasias tend to be more numerous in people with other scleroderma related vascular disease (i.e., pulmonary arterial hypertension). The number of telangiectasias and the sites involved tend to increase over time....

Other
Other symptoms of CREST syndrome can be exhaustion, weakness, difficulties with breathing, pain in hands and feet, dizziness and badly healing wounds. Patients with lcSSc commonly induce pulmonary artery hypertension which may result in cor pulmonale (heart failure due to increased pulmonary artery pressure). Cause
CREST syndrome involves the production of autoimmune anti-nuclear and anti-centromere antibodies, though their cause is not currently understood. There is no known infectious cause. Diagnosis
CREST is not easily diagnosed as it closely mimics symptoms of other connective tissue and autoimmune diseases. Diagnoses are usually given when a patient presents two or more of the five major clinical symptoms.