Those who challenge conventional views or vested interests in science are likely to encounter difficulties. A scientific dissenter should first of all realize that science is a system of power as well as knowledge, in which interest groups play a key role and insiders have an extra advantage. Dissenters are likely to be ignored or dismissed. If they gain some recognition or outside support, they may be attacked. In the face of such obstacles, there are several strategies, including mimicking science, aiming at lower status outlets, enlisting patrons, seeking a different audience, exposing suppression of dissent, and building a social movement.