What are the names of any scientists who worked on projects named 'Matter of Time' and 'A Puzzling Pattern'?
select t3.name from assignedto as t1 join projects as t2 on t1.project = t2.code join scientists as t3 on t1.scientist = t3.ssn where t2.name = 'Matter of Time' intersect select t3.name from assignedto as t1 join projects as t2 on t1.project = t2.code join scientists as t3 on t1.scientist = t3.ssn where t2.name = 'A puzzling Parallax'