dd637b1b_Particles_vs__strings__particles
[topic] dimension [strings] Known string theories do exist in D>4. They effectively predict "critical" D=10, 11, or 26. If the observable dimensions are constrained to 4, predictive power is lost. However, useful particle models can be accomodated. [particles] 
Predictive particle theories do not exist in dimension D>4, and thus effectively predict the correct result D=4 (3 space, 1 time).
Particles vs. strings
particles