| ▲ | tsss 3 hours ago | |
Your comment is suspiciously missing the part where your students performed measurably better after decreasing CO2 concentration. | ||
| ▲ | wffurr an hour ago | parent [-] | |
Assuming they had any control over the ventilation in the room. | ||
| ▲ | tsss 3 hours ago | |
Your comment is suspiciously missing the part where your students performed measurably better after decreasing CO2 concentration. | ||
| ▲ | wffurr an hour ago | parent [-] | |
Assuming they had any control over the ventilation in the room. | ||