Top 100 presentations

1. Continuous Verb Tenses
   35383
2. Support and transport in plants
   33877
3. Anyong Tubig Anyong Lupa sa Asya
   29335
4. Elements compounds and mixtures
   26054
5. Chromosome
   22053
6. Simple Verb Tenses
   20806
7. Atomic Structure
   20272
8. Balancing Chemical Equations. Balancing redox equations
   20167
9. Periodic Behavior
   19913
10. Newton’s laws of motion
    18896
11. Periodic Trends
    16757
12. Adverbs
    16649
13. Percent Composition, Empirical and Molecular Formulas
    15991
14. Animal Farm
    15810
15. Bonding, Molecular Shape & Structure
    14754
16. Circulation and Gas Exchange
    13486
17. MakingFood
    13418
18. DNA - An overview
    13104
19. Atomic Structure and Periodic Trends
    12909
20. Fungi
    12897
21. Volumetric
    12687
22. Feminism- Cure or Curse
    12563
23. Atomic Structure and Periodicity
    12526
24. Hormones and the Endocrine System
    12173
25. Animal Development
    12117
26. Derivation Applications of Bernoulli Principal
    11917
27. Osmoregulation and Excretion
    11513
28. Plasma Membrane-Gateway to the Cell
    10811
29. Plant Structure, Growth, and Development
    10772
30. Acid, bases and salts
    10312
31. Development
    10225
32. Mirrors and Lenses
    10191
33. Structure of the Atom
    9947
34. Balanced forces
    9928
35. Ancient Civilizations
    9838
36. Mass Spectrometry
    9770
37. Pronouns
    9744
38. Nouns
    9694
39. Resource Acquisition and Transport in Vascular Plants
    9534
40. Forests
    9396
41. Support and transport in plants
    9369
42. Atomic Structure
    9311
43. Cell Types and Cell Structure
    8993
44. Newton’s third law of motion
    8946
45. Animal Nutrition
    8725
46. Transplantation Immunology
    8645
47. Cellular respiration
    8513
48. Growing Plants
    8376
49. Sensory and Motor Mechanisms
    8363
50. Electrical Circuits
    8262
51. Plant Responses to Internal and External Signals
    8217
52. Lab Equipment
    8046
53. Prepositions
    7994
54. Neurons, Synapses, and Signaling
    7908
55. Viruses, Viroids, and Prions
    7902
56. Of Mice and Men
    7834
57. A Tour of the Cell
    7750
58. Basic Structure of a Cell
    7672
59. Real time PCR and it's functions in diagnosis
    7636
60. Covalent Bonding (Molecules)
    7594
61. Plant structure adaptations and responses
    7548
62. Ionic Bonding
    7459
63. Cellular Division
    7449
64. Mendelian Genetics
    7110
65. To Kill a Mockingbird
    7078
66. Satellite Orbits and Uses NIS
    7040
67. Blood Type Genetics
    7034
68. Sound
    6943
69. Molecules and Ions
    6927
70. Well logging The Bore Hole
    6908
71. The Immune System
    6861
72. Membrane Structure and Function
    6787
73. Animal Reproduction
    6739
74. The Chemistry of Acids and Bases
    6684
75. Angiosperm Reproduction and Biotechnology
    6675
76. Plant Diversity
    6616
77. Rocks
    6612
78. Mendel and the Gene Idea
    6610
79. Cell Communication
    6572
80. Balancing Chemical Equations
    6510
81. Rate Laws
    6370
82. Drama
    6340
83. Introduction to Oscillations and Simple Harmonic Motion
    6334
84. Hybridization of Orbitals
    6326
85. The Building Blocks of Matter Atoms
    6265
86. Empirical Formula
    6218
87. Electron Quantum Numbers
    6180
88. An Introduction to Metabolism
    6167
89. Translation. Protein from RNA
    6095
90. Neurons
    6044
91. The Structure and Function of Large Biological Molecules
    5993
92. Photosynthesis
    5927
93. The Mole
    5913
94. Cell Membrane + Tissues & Organs Definitions
    5886
95. Earthquakes
    5845
96. Karyotypes
    5843
97. ADP, ATP and Cellular Respiration
    5807
98. Endocrine System
    5757
99. Classical greek philosophy
    5707
100. Population Ecology
     5668

Research and Development, Experimental aerospace engineering center in Serbia (Space Technologies)