(1) Nagarjuna, (2) Rishi Bharadvaj, (3) Aryabhatta, (4) Jagadish Chandra Vasu, (5) Chandrashekhara Venkataramana, (6) Ramanuja ( together with the scientists mentioned in the previous shloka ) are the wise persons to be reckoned with. 

Nagarjuna 
Famous Buddhist philosopher Nagarjuna, who was born in Vidarbha, made a  deep  study  into  the  Buddhist and Brahmanical philosophies, and, later set up his residence at Sri Parvat ( that came to be known as the Nagarjuna Konda, of district Guntur in Andhra Pradesh ). He had been a contemporary and friend of the king of Andhra, Gautamiputra Yajnashri ( extant in Kaliyuga's years 3267 to 3297 i.e. 166 to 196 A.D ) He was also an erudite Ayurvedic physician and an expert in Chemistry ( Rasayana Sastra ). His Astanga Hrdaya is an important work on Ayurveda. There are numerous works those are considered to be authored by Nagarjuna but his two most important philosophic works are : Madhyamika Karika and Vigraha Vyavartani. His Philosophy is known as Sunyavada ( Nihilism ) and it is considered to have place of principal importance in Buddhist thought along with the two other equally important philosophic schools of Sarvastivada ( doctrine of ' all is real ' ) and Vijnanavada ( Idealism ). That is why Buddhist philosophers .interpret Sunya as something different from ' Void ' or ' Zero ' or ' Nothingness ' which is just the literal meaning of Sunya. Attainment of Sunyata is Nirvana ( ultimate release from the cycle of birth and death ). An alternative name  of  Shunyavad  is  Madhyamika Darshana   which   is   positive.   In Vigrahavyavartani Nagarjuna argues as how he does not have any quarrel with the philosophy of ' all is ' and Citta-matrata philosophy. At the time when, it is preached, the Greek science came to India, indeed, at that very time Nagarjuna's work on Chemistry was being translated in the Chinese and the Japanese languages. 

Bharadvaja 
' Seer of the sacred-formula ' ( Mantradrasta ) Vedic-Sage,  well-versed  in  the Aeronautics ( Vimana-Vidya ), wise professor, Maharshi Bharadvaja is said to be the author of books such as Yantra Sarvasva ( Complete Mechanics ), Amsu Tantra ( System of Sun beams ) and Akasa-Sastra ( scientific treatise on Space ). In Yantra-Sarvasva the mechanism concerning the construction of an aeroplane has been explained in accordance with aeronautics and the steps in the process of such a construction are described. In the section dealing with the mechanism of an aeroplane ( Vaimanika-Prakarana ) a list of twenty five ancient books on aeronautics together with the names of the earlier Acharyas of the science has been given, from which it is known that in ancient India construction and flying of the aeroplanes was fully known. Maharshi Bharadvaja had his famous Gurukul ( residential teaching institute )  in  Prayag near  the  Sangama ( confluence of rivers Ganga, Yamuna and; Sarasvati )

Arya Bhatta
Extant in Kaliyuga's 36th century ( 5 th century A.D.), Arya Bhatta has been a great teacher of astronomy in Bharat whose work on astronomy, known as Aryabhatiyam, is regarded as the oldest book of its kind, that; the later astronomers and astrologers acknowledge as the Arya Principle ( Arya Siddhanta ). Far earlier than Copernicus, Arya Bhatta propounded and adopted the theory that not Sun but Earth revolves around the former. 

Jagadisa Candra Vasu 
Extant in Kaliyuga's years 4959 to 5038 ( i.e. 1858 to 1937 A.D. )

Born in East Bengal, a great scientist of India, Jagadish Chandra Vasu ( Basu ) had a deep interest in the sciences of Botany and Physics. After having his studies in England, Vasu returned to India in the Kaliyuga year 4986 ( 1885 A.D ) and started work as a professor of Physics  in  the  Presidency  College, Calcutta. He made a machine to produce electro-magnetic radio waves. In Kaliyuga year 4996 ( 1895 A.D. ), with the help of these waves he made a telephone ring sound at a distance of 75 feet. Marconi by developing the use of these waves brought out the invention of radio. Vasu then, with the use of the scientific appliances ( apparatus ) proved that the plants too have life ( sajivata ) in them and are capable of reaction and response i.e have  Pratikriyasilata ( respondability )  them. He was elected a member of the Royal Society of London. In the Kaliyuga year 5018( 1917 A.D.)  he established Bose Research Institute in Calcutta.

Chandrasekhara Venkataraman
Extant during the Kaliyuga's years 4989 to 5071 ( i.e.l888 to 1970 A. D. )

Very well-known scientist, a physicist who by working on reflection of light discovered a new phenomenon that came to be known after him as ' Raman-Effect 'and fetched him the Nobel Prize in physics, in 1930  A.D.  Born  in  Trichanapalli ( in Tamilnadu ),   Chandrashekhara  Venkata Raman had his early education inWaltair ( Vishakhapatnam in Andhra Pradesh ) and higher education in the Presidency College, Madras. Thereafter he joined govt. service at a high position. But being research minded he continued doing research during spare time from his govt. job, at first, and later engaged himself fully in research work, left govt. job, became a professor of Physics in Calcutta University, Secretary of the Science Association and Fellow of the Royal Society of London and then the Director of the Indian Institute of Science in Bangalore. He did all his research of the highest order staying in India only. He was a man with so much self-respect that he used to tell his students, " Do not go by the words of the foreigners till their truth is proved ? "

Ramanujam
Extant during Kaliyuga's years 4988 to 5021 ( i.e. 1887 to 1920A.D. )

Born in Kumbhakonam city of Tanjaur district of the Madras state in 1887 A.D. Ramanujam was the son of Shrinivasa Ayanger, a poor but self-respecting individual.  Ramanuja  loved  Mathematics. Even as a child, as student of the 4th class of the primary school, Ramanujam started taking interest in Trigonometry. Even as a student he had known many formulae of Mathematics by his own effort. On being known of his wonderful genius he was called up to be in England. There he did research in Mathematics with the co-operation of Prof. Hardy and was elected as a Fellow of the Royal Society. Because of his untiring hard work for research and of his not getting properly nourishing vegetarian food in England he died of Tuberculosis at a short age of 33 years. The areas of Mathematics to which Ramanujam made his special contribution are known as the theory of numbers, theory of division ( partition ) and the theory of continuous fractions. Even when he was about to die his brain was so awake that when some one made a mention of a car number 1729 he at once asserted, " Yes, I know this number. It is that smallest number which can be presented in two different ways as addition of two cubes : ( 10 to-the-power 3 + 9 to-the-power 3 ) and ( 12 to-the-power 3 + 1 to-the-power 3 )."